Board Thread:General Discussion/@comment-28888404-20160706064939/@comment-16461120-20160706074617

It was an editorial decision. The Earth-1610 was not recreated as a convenient plot point. Likewise, if there is a story reason for it to be resurrected at some point in the future, then it will be, just like Earth-295 before it.

To answer your second question, Spider-Man and The Maker survived aboard The Cabal's Life Raft; meanwhile, all the other characters from the Ultimate Universe died in the incursion shown in, then in Miles' supporting cast was resurrected by Owen and transplanted to Earth-616 to show his appreciation for the cheeseburger Miles had given him.