I hope customer protection will eventually force new terms on the "you buy the rights to view a movie which can be revoked anytime without reason". Like, given that most digital offers are priced nearly as high as their physical counterparts, there should be a law that the right must be given for at least 50 years or so.
I think that that would be hard to make work from a business standpoint. Too hard to reserve enough cash to operate for 50 years; businesses can go under.
Maybe just buy the physical movie.
I mean, a Blu-Ray or whatever is popular these days movie plus a player is self-contained and will keep working as long as you don't damage one or the other.