If he was one of the ancient elves who entered Uthenera I'd laugh if he woke up and carried on like it was business as usual.
Solas: Is there anything left in the pantry? Uthenera or not, walking around the Fade is hungry work.
Inquisitor: Uh...
Solas: (messing with a stack of books) Oh, and a pot of tea with a bit of honey if we have any.
Inquisitor: You do realize we're standing in a thousand year old ruin right?
Solas: (looks up) I suppose I overslept then.
Inquisitor: I suppose so.
Solas: So that's a no on breakfast I take it?
You know, I'm not sure what it says in lore about uthenara, in terms of whether elves can waken from it naturally, etc. We only know that they used to go into it when they reached a certain age, but not if they ever actually wake up again. In fact, considering the song Leliana sang about it, it sounds like it might as well be death. The elf sort of becomes a guardian spirit in the Fade for his or her people, but never wakes again. Anyone have more information on this from some other source? World of Thedas (I should buy that book, I really should), or the comics maybe?
So, basically, if Solas were an ancient elf, somehow, I wonder if it would be a huge deal for him to actually be awake and wandering around again. I wonder if it's even possible for an elf to choose to reawaken, knowing disaster is happening in the real world, or if they're just stuck in the Fade.
That said, your little dialogue skit is hilarious.