The whole wall didn’t fall. Just a section of it. Presumably they weren’t standing on that section.

They need to kill the “moderator approval” delay if they want this place to flourish.

Doesn’t make that much sense really, but on the other hand Bran can see all of the past and probably knows Sam is good people and that Sam/Jon are tight.

Too important to get off screen deaths IMO, improbable as their survival may be.