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According to Wikipedia, John was married to Cynthia from 1962-68; then to Yoko. Ringo married in '65; George in '66.

Stunning counterexample.

I know this is an old thread, but Bach, Mozart, Debussy, Wagner, Rachmaninov, and Richard Strauss (off the top of my head) were all married.

Bach also fathered 20 children.

It depends. Yoko either influenced John's creativity or his relationship with her reflected his shifting values. Either way, it wasn't a lack of creativity that broke up the Beatles, it was a rift between what they wanted to express in terms of art.