And man that plan. I was one of the people who didn't think he'd be aiming to dismantle the Veil, because look at what the Breach did to Thedas. I thought him wanting that wouldn't be in character. Turns out his character was just more ruthless than I ever thought. And I don't know. On one hand (haha) I want the Veil gone too. I want to see the Fade wash over the world, and for Thedas's current oppressive power structures to collapse. But on the other hand, I suspect doing that would make Thedas inhabitable for all modern races, even elves. The anchor was the only reason Quizzy and party were able to survive the Fade after all, and we couldn't even hold onto the anchor for longer than 3 years, give or take.
And how's he going to go about removing the Veil?
...I've thought up this horrible theory that since the anchor's no longer an option, he might go with what the magisters did: mass blood sacrifice (of mostly elven blood), only on a worldwide scale.
Somebody please tell me there's another way T_T
I doubt he'd resort to that. 
The magisters appropriated most of what they knew about magic from the crumbled remnants of Elvhenan and the ancient elves they enslaved. Listen to party banter between Dorian and Solas, and most of the things Dorian believes have Tevinter origin (various spells, artifacts, "first ever" person stepping physically into the Fade, etc), Solas counters started with Elvhenan.
Even then, it was magic they barely understood and wielded like children playing daddy's gun they found lying around, like Corypheus with the Orb. (Remember how he tried to take the Anchor from the Inquisitor at Haven, then was surprised that it didn't work, whereas at the end of Trespasser Solas removed it without any problem?) Reading some codex entries of the magisters that first entered the Golden City, they sound like they pieced their spell together from scraps of elven lore and input from elven slaves because they barely knew what they were doing, while Solas, who has spent untold millennia exploring every inch of the Fade and created the Veil in the first place, knows exactly what he's doing.
Finally, it sounds like Tevinter human mages just aren't as powerful as ancient elves (makes sense, considering they were formed after the Veil went up), so they often resorted to demon summoning and blood magic to artificially boost their power. The codex entries about the magisters that tore the Veil also revealed that they needed elven blood en masse for mysterious reasons. As of Trespasser, we know that elves are intrinsically tied to the Fade in ways no other race is, so in a way it would make sense that human magisters need elven blood to help trigger a (implied) elven "enter the Fade" ritual.
Solas is an ancient elf at full power who knows the Fade better than anyone. I don't think he'd need to resort to blood magic or elf sacrifice since he's powerful enough that he doesn't need it (he turned a whole fleet of Qunari into stone with a thought!
) and is an elf and knows the Veil well enough that he can find another way. 