Hypothetically, The Beatles could have resolved their personal differences and agreed to continue to work together as a band, and sometime in the fall of 1970 released the following album, Beatles XIII (awesome title, right?) :
Side One
1. Come and Get It
2. Cold Turkey
3. All Things Must Pass
4. Junk
5. Maybe I'm Amazed
6. Isolation
Side Two
1. What Is Life?
2. Look Me
3. Every Night
4. It's Johnny's Birthday
5. Wah-Wah
6. It Don't Come Easy
7. Instant Karma!
The songs on the first side present a loose concept/theme on the frustrations of wanting things, needing things, the impermanence of things, side two gets philosophical, introspective, a little silly, a little crazy, Ringo's blues brings the theme back into focus and Lennon offers a solution, sort of.
(Followed later in the year by the non-LP single "My Sweet Lord" b/w "Mother")