First, if you'd listened to the Dalish clans prattle on about their lost civilization, it's clear that the highest objective of the Dalish is to restore what was, not to take what scraps they have and create a broken nation based on historical breadcrumbs. The defining aspect of the Dalish is that they're not remnants of a lost civilization that only wants to settle into a peaceful life; they're essentially elf-cults dedicated above all others to picking up the pieces of lost elven civilization. So your vision is actually invalid for any Dalish clan.
Secondly, do you not hear Solas saying that the works of the ancient elven empire is intrinsically tied to the Fade? That means without the Fade's return, the Dalish could not recreate their empire even with all the knowledge in this world, because they're physically diminished, physically unable to harness the advancements of the elven civilization. Even if the Dalish forms an empire and conquers all of Thedas, they'll still just be a better-informed, more powerful Dalish clan, and not Elvehnan. They want Elvehnan.
And as for your comments regarding Solas...well, I suppose your inquisitor thinks as your inquisitor does. But you did not make a point by ranting on how you feel about Solas.
The Dalish don't know ancient elven civilization. They THINK they know. And Solas comes along and tells Lavellan her People have got it all wrong.
So, some of the elves think he'll restore them to some former glory when his plans might actually be VERY different.
And why must the Dalish recreate an Empire? Who created the old elven empire were creatures with great magic who became known as gods because they had more power than the rest. The elves that live today don't have the same goal as the slavers of their ancestors.
If the legend of Shartan is an indication of what the elves truly want, is that they want a homeland. Not to become high and mighty again, but to be an independent people. To have a nation, an identity as a group, a unified culture using the few scraps of mythology they recovered from the Dales. From the DALES, their former free nation, not from Arlathan, the tyrannical empire.
And that is NOT what Solas wants. His goals are not altruistic. They are SELFISH.
He only wants to restore the ancient civilization where he lived. That's why my Dalish Inq will never follow Solas. He is not thinking about what is good for the People. He wnts to get rid of the Evanuris forever and live in a world where he can live with spirits again. And the very fact that he'll make use of such power rather than spare innocent lives in this folly is because no elf should support his madness.
He's no leader. He'll just pretend to be one and make false promises to the People so as to have help to achieve his goals.
It's the same thing he did with the Inquisitor. He USES people. Therefore, he doesn't care the least about them.
If he succeeds, he might just bring about an age of tyranny, with the elves as his minions. And how is that better than the Tevinter Imperium, the Qunari or Orlais? In the end, he might end up acting just like the Evanuris. He might become what he hates the most. And he'll drag the People along in this folly.
I'd stand with my dalish fellows anyday rather than support a manipulative tyrant. The Dalish are not tyrannical. They're a free people who fight for the right of self determination, the right to have a home. That is all.