They also used to have intermissions and live orchestras, so things can change.
But what's going to make it change even faster it's people poo-pooing the cinema experience and saying "Oh it's just as good at home."
True, there is no pause button in a theater and one commercial break helps make that bathroom break easier, since the concession stand doesn't sell - eh, nobody would want them to either which way... or since people didn't live as long back then, the ability to hole in pee couldn't have been for as long either...