After Kurt's failed attempt at taking his own life, Courtney would have made Kurt sack his bandmates convincing him it was his idea.
Kurt after a hiatus would have become a solo artist playing small pubs/clubs and not releasing under his own name.
He would have become a recluse a bit like J.D. Salinger.
He would have divorced Courtney whose band Hole would not be successful because she couldn't release their first album on the back of his death which is what happened with the release a week after Kurt died....Classy.
I think Dave would have first toured with Tom Petty, made music with other bands and then formed the Foo Fighters.
Okay what would have happened if John Bonham had not passed away would Led Zeppelin have continued for years to come?