Back in the original days of the SNL, Lorne Michaels would come out in front of the audience and offer to pay the Beatles $1,000 to re-unite on the show.
The story goes that one night, Paul was visiting John at Dakotas and we’re watching SNL and seriously thought of driving to the studio to make an impromptu appearance. But they chose not to.
That would have been awesome to see.
IIRC Paul said most likely had John lived, they would have reunited for Live Aid.