Felassan and Solas both admit the ancient elven empire was just as bad. It had slaves... it had class disparity... it had the rape of the natural world... it had genocide (of the dwarves) AND... if hints become fact, that empire gave birth to the greatest threat the entire planet has, or may ever, know - the darkspawn.
Inky: "This war proves that we can't go back to the way things were. I'll try to help this world move forward."
Solas: "You'd risk everything you have in the hope that the future is better? What if it isn't? What if you were to find that the future you shaped is worse than what was?"
And that's Solas's assessment of situation regardless of their relationship with Inquisitor and Inquisition.
Call Solas biased as much as you wish. But he is actually one of few people who saw both worlds and has a frame of reference. And even with sins of past world, he still thinks than it is better than what is now. Like.... modern world has absolutely everything old one has: class disparity, rape of the natural world, genocide (effectively of the elves, spirits and not doing much to help dwarves who face extinction) and rampant Blight. And as far as we know the Blight is a separate source of magic from blood or Fade. So if Fade will stay separate from the world, or perhaps even disappear one day, what will exist there to counter the Blight?
So things are definitely not better and require change. Any change it seems, as we don't yet know if Flemeth and Solas see the world having to go in the same direction - both of them however are working towards it and both of them see it as better than what is now.
For me - arguing studying the Fade, magic and spirits is an entirely different topic than: "Should the modern world be wiped out to re-create a second elven empire."
It's been said more than a zillion times now - this is NOT about creating second elven empire 
It IS predominantly about Fade, magic and spirits and their return to the world. Even if it doesn't mean the literal wiping of modern world it effectively means the end of civilization, world and people as we know it.
For me.. the storytelling device is the same one used in Harry Potter. At the end - Harry Potter destroys the most powerful magical wand in the world and tosses it. Why? Because he's grown up and realized that magic isn't a solution to anything (which is juxtaposed against his childhood belief of 11 that magic will make everything better). It comes with its own problems. He doesn't reject magic - he just doesn't fall for the illusion that magic is a cure all.
Er, no. He doesn't reject magic. Like, at all. What he rejects is an artifact with near-infinite power that is easy to abuse.
Which... you know... is precisely what Solas has done all those thousands years ago:
Vivienne: I confess, Solas, I expected you to be back at the Temple of Mythal.
Vivienne: Some powerful magic yet remains there... if it can be trusted.
Solas: For once, we agree. Many relics were lost for good reason.
Vivienne: You explore the Fade to ferret out such secrets, do you not?
Solas: When I awaken each morning, all I have with me are those secrets.
Solas: The power at the Temple of Mythal is tangible, potent... and far too easy to misuse.
Vivienne: We are not so different after all, my dear apostate. We both believe magic must be limited safely.
Solas: Only a fool would ignore such a stark reminder of the destruction of an empire.
Solas: We may disagree on many things, Enchanter. But neither of us is a fool.
Vivienne: You are too kind.
... Which is exactly why I have to shake my head at the whole notion that Solas wants to return exactly to how things were, elvhen empire and all. It's clear that Elvenhan had to go because of the abuse of power. But the problem of abuse of power is different than an issue of whole realm of magic being on its way out and the consequences it has for everyone.
Lastly - Solas didn't make anything. This is like saying that gravity made humanity... or the sun made Rome... or the meteor that killed the dinosaurs made Bioware. It was an event... what came after it has nothing to do with Solas. Solas played no part in the shaping of history after the fall of Elvenhan.
Er... gravity did make humanity in shape how it is. So did changes to the world after K-T event. If it wasn't for it, life would evolve in a different way it did.
And yes - what came after has *everything* to do with Solas, because it's his invention that has changed the world. Profoundly. We're talking about the realm where magic exists and reality can be shaped with will and shifting of perception - and a barrier that has cut most people from means to do it and brought in eventual fear and lack of understanding of what was previously part of their world. To say that Soals played no part in shaping history after fall of Elvenhan is nothing short of naive - he has so much to do with it, that he can even be argued to be modern Thedas's Maker.
And that's just assuming that he dropped the Veil and didn't do anything aside from that while he was stuck dreaming. Which we can't really say that he did. We know that he's led his people and sent agents when he was dreaming - and we have no idea how they've influenced the world via Flemeth-patented method of nudges and shoves. We know that he's been trying to contact people through dreams, to varied effect.
We also know of peculiar wolf worship in early human cultures (the Alamarri considered wolves sacred; guides of humanity in fact - later, the wolves were companions of humans) - it even makes Fereldan attachment to wolves and dogs particularly suspicious. Interestingly enough, even Kenric in JoH says that he forgot Fen'Harel in his memory game, Solas can bitterly remark "most people do". So we have no idea of his extent of influence on the world aside from the obvious.
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Have a good day.
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