I'm a fan of what Disney did with MoviesAnywhere-- buy a movie once and it becomes playable through all participating linked providers. So you can, for instance

I'm a fan of what Disney did with MoviesAnywhere-- buy a movie once and it becomes playable through all participating linked providers. So you can, for instance, buy a movie on Amazon and play it back on iTunes. The catch being that it only applies to movie purchases by participating studios. No rentals, subscription based streaming, or TV shows. But imagine if that's how other services worked. One can always dream.