There seems to be a single fact people here are skipping over, Emit-Selch himself has said ascians view the inhabitants of the Source and the 13 shards as not being alive.

So it may entirely be possible that they get taken into the lifestream and split up to join Hydaelyn's order as new people. But yes the possibility also does exist that dead is dead.

The only one I can have some expectations of returning as he was is Lahabrea.