This is probably a more broader subject than just football rights but I think we're going to see more and more changes to the way subscription tv is offered in the future. As
@MissChief touches on, Sky have already fragmented their offering into smaller packages so people can pick and choose what content they want to pay for and what they don't. With Amazon moving into sports and with DAZN growing all the time, that's only going to put Sky under more pressure to be even more innovative with how they offer their content. I'm sure it won't be long before we'll be able to buy PL football from Sky, BT, Amazon or whoever else without having to pay for every other sport and or having to pay for their 'entertainment packs' too. Obviously if you're the person that wants all the entertainment packs, movies and every sport from every provider you're probably going to be worse off but hopefully it'll benefit the majority.