John Lennon had plenty of time to reunite The Beatles between the Fab Four’s breakup in 1970 and his untimely death in 1980. However, this never happened. During an interview from 1970, John explained why he thought recording with The Beatles again would be pointless — even if it made sense at one time.
In the book Lennon Remembers, which includes the transcript of a 1970 interview, Rolling Stone co-founder Jann S. Wenner and John discussed The Beatles at length. At one point, John revealed he was going to meet the other members of The Beatles soon to discuss financial matters. Subsequently, Wenner asked if John would record with them again.
“Not a chance,” John replied. “I wouldn’t record with anyone again. I record with Yoko, but I’m not going to record with another egomaniac. There’s only room for one on an album nowadays, and so there’s no point.”
Source: cheatsheet.com