Nirvana would've been over by 97 or 96. I'm willing to believe Courtney for once and once only about Kurt actually hating Dave (just watch the unplugged ffs) so he goes solo, maybe invites Krist to play on his solo records. The first record does well both financially and with the critics, releases 3 more albums, the last one being mediocre. With the raise of 2000's emo, Kurt falls into irrelevancy, which he isn't mad about since he always resented fame anyways. Afterwards he becomes Varg 2.0 but leftard, a hermit that releases albums and demos on an independent label and collaborates with DIY artists like Ariel Pink before he learns Ariel is a right winger. Foo Fighters never makes it past the third record as the critics would not be as benevolent with Dave's one trick pony band as Kurt would still be alive. Krist becomes the frontman of a punk rock band and plays shows with Kurt from time to time