Will we ever go to this Alternate Future?

[Vulcwen]

Frankly, The Echo might allow the WoL to catch glimpses of the future, after all it is G'raha's relative past.

Actually, we already did. Remember the scene in Ishgard with all the rumbling and people looking at Heavensward (the book)? That was most definitely a vision of the Bad Future timeline.

That said, I think we could send something to the time where the tower vanished to dump some knowledge on them, as a token of thanks, although that'd be the limit.