That's why Flemeth is da real mvp.
While Solas and Abelas are elven elitists, she still considers the modern elves as part of the People.
I think the reason Flemythal considers post Veil people as people is because Mythal possessed Flemeth and that probably gives her a better idea and lets her empathize more than what Solas can.
In Trespasser, Solas shows that the year he spent with the Inquisitor changed his concept about the people living in the present. Once, he thought thedosians were nothing but strangers, Tranquils, in his own words. Now, the very idea of letting the world burn in the raw chaos causes him some remorse and he no longer contemplates his plan with the same ease that he once did.
If Solas would only spend enough more time around modern day thedosians, he might've developed the same empathy that Mythal did.
Maybe there's hope for it in DA 4. Maybe living and teaching the elves that decide to follow him about Arlathan and the past will make them grow on him. And then, perhaps the Inquisitor will be able to change his mind in the very end, before he makes his final decision.