I don't get your obsession with dancing to The Beatles. They're not the only band that's existed since 1963. I agree that they're not the most ideal band to dance to, especially after they got more "artsy" but plenty of bands maintained a danceable beat as part of their musical architecture. If what you are saying is that "Music from 1959 no longer exists" well, of course it doesn't. It's not 1959. But things have evolved and much of the same intent, and much of the same structure and beat still carry on in a variety of music today. Some of it more overtly rock than others.
But you're creating your own small world for the sake of argument. You're insisting that everything be EXACTLY like the original bands, yet when somebody brings up one that is (Stray Cats), you say its a throw-back band. So how could a band be the same, but not be? And if then they don't have to be the same, you'd end up with what we have. A big stew of bands variously influenced by rock. Some close, some not so close. Some danceable, some not.