Apparently John Lennon was toying with the idea of going back to writing some songs with McCartney before he was killed.

Eric Dolphy was the person who I had in mind when I made this thread. He never seemed to really reach the mainstream enough to have as massive an effect on the jazz world as someone like Miles or Coltrane might have, but I think that given even as little as two or three more years he could have revolutionized the jazz scene just as significantly. Just before he died, he released Out to Lunch!, an incredibly significant avant-garde (not free, really) record. He also collaborated with the Instant Composers Pool as his last performance. I'd like to see where he would be at if he had a longer life span, but I can't quite predict where he'd go because Out to Lunch! is incredibly fresh, even today. It's a shame that he ended on his most innovative note.

I'm with you. Out to Lunch! is a fantastic album and really wish I could have heard what he would have done next.

I heard it was more like on a whim he stop playing with The Beatles, and on a whim he could get the band back together, but it never materialized. If anything if they got back together their sound would be somewhere between Let It Be and The Traveling Wilburys vol.1. - I imagine.

^
The breakup of the Beatles was a very complicated event which had gradually been underway for about 3 years. It wasn't just one band member either, both Lennon and McCartney were at fault and even both George and Ringo had walked out at one point.