I presume you've done the level 80 dungeon The Twinning? Seeing as you were prompted to go back and do Alexander.
I think this more or less confirms that there's no major developments for Alexander to come.
Seeing as Garlond Ironworks essentially reverse engineered it along with Omega to send the Crystal Tower back in time to the First.

Besides, if Alexander did come back in some way, it would kinda defeat the point of it calculating all possible scenarios and determining that the best course of action was to essentially permanently shut down to exist in a single moment of time or time loop.

I did like the story of Alexander, even if the fights themselves are mostly annoying goblins.