Plenty of bands from then have toured with original members of a couple replacements years after they initially broke up. The Rolling Stones, for instance have changed much of their line-up. Pink Floyd is another example.
If John Lennon had not been killed, the Beatles could have toured in the 80s, 90s, 2000s, 2010’s by reuniting or replacing a different member or two. Many other bands of that era have broken up and then reunited to tour.