I don't think they had anything more to say as a group.
A large part of the Beatles breakup was the fact that they had stopped touring, having done their last concert in 1966. They had concluded that there was no way they could duplicate their studio sound live. I mean, 8 tracks - - 8 tracks! - - how could a band be expected to duplicate that in concert?
Without regular gigs to keep them together they more or less went their separate ways, even as they continued to record some of the greatest music ever, like Yesterday and Today, Revolver, Rubber Soul, Sgt. Peppers, Magical Mystery Tour, Yellow Submarine, the White Album, Get Back (AKA Let It Be), and Abbey Road.