Vanished universes?

[pogo_boy]

"I've heard there are some people here now who are from universes that disappeared after they left. How do you know if a universe has really disappeared if you can't get back? Does this happen to pocket universes too?"

"Do they ever come back? Can they come back?"

"A-and what happens to the people there? If they vanish too, it... does it mean they're dead? I'd like to know. Please."