There will never be a band more popular or famous than the Beatles. John Lennon wasn't too far off the mark when he made the controversial comment that got him into some hot water with the religious right, "The Beatles are more popular than Jesus Christ" because they really were. A fanatical following that has never been matched and most-likely never will be.
Whether that would equate to a successful pinball theme is debatable but it's hard to imagine that it wouldn't be a success marketing wise. The licensing would probably be prohibitive though.
Those of you who were not born yet when the Beatles were still around will never know just how iconic they were. You could have asked anyone from any age group who the Beatles were and almost everyone knew them. You can't say that about Rob Zombie or a band like White Zombie. Nowhere even close to the popularity (or talent) of the Beatles.
But that being said, I do think a Rob Zombie pin would be awesome and his "horror" theme lends itself well to a pinball artwork. I wouldn't mind having one.