So Solas is choosing the worst options of Mass Effect 3. Yay. 
Wait, how is him not doing anything the same as Refuse? I'd say that is more the Destroy choice than him continuing his plan is. Or did you mean it that way?
Well, all I meant was that Solas chose to destroy the Evanuris (he did the best he could at any rate) rather than do nothing and let everyone die. At least, that's the impression the players have been given at this point. It was a sadistic choice.
Also I think those are the best endings from ME3, because any ending with the Reapers still existing is automatically worse for me 
Seeing how the titan was uncomfortable with the breach i argued that the world of the elves could have been just a world suited for their needs no different from modern cities which are functional for our needs.
I didn't get the impression it was uncomfortable, I just thought it was waking from hibernation because of the newfound reconnection to the fade. I don't remember that DLC perfectly though, so I could be wrong.
That said, I would argue that it perhaps doesn't extend farther though. Solas raised the Veil to separate reality from the world of dreams. The Fade is something that touches all life, and thus the Veil is also connected to everyone living. It is one thing to create such a magical construct that affects a continent and the surrounding areas, but it is another thing entirely to have it affect the entire world.
Actually it may not be another thing entirely. The veil is described as more of a metaphysical barrier and a barrier of perception than a physical one. This is magic we're talking about too, keep in mind, so I could totally see it just as easily (perhaps even more easily) affecting the entire world rather than some of it.
A good person knows when to stop and a good person knows what is wrong and not to do it at all. It just seems to me that the writers were just plain 'ol lazy of not giving Solas a happy ending he deserves, but instead they made him another Corypheus who wants to tear down the Veil. Even if he succeeded it would all be for nothing because the elven gods would wreak havoc and kill him and all of this would be for nothing. *sighs* They could've wrote it better than that.
That... is a very limited view of Solas, in my opinion. People are complicated in real life, and Solas being complicated (and appearing contradictory) is not unrealistic at all. They can do wrong things for the right reasons, and even right things for the wrong reasons, and anywhere in between. And if you think Solas is just another Corypheus, I think you missed a lot of his character. He is a foil to Corypheus. Some similarities, yes, but he is designed to mirror him much more than emulate him. And that was done on purpose, so I wouldn't call it lazy writing.