And most likely only be on newer gens.
I think that would show very bad form if they did, and it would be the point where I draw a line with the game.
I can understand having to make the 1.3 only available on PS4/XB1, due to the increase in power required. Having 1.4 only available on next gen consoles however would not be out of necessity, as the power difference between PCs capable of playing 1.4 and current gen consoles is minimal.
It would be the only game I know that will have required 3 generations of consoles for 2 updates.
I wouldn't buy the game again on PS5 just for that update. I've already purchased it on PS3, PS Vita, PS4, mobile and PC. I would not buy it a fifth time. It's an amazing game, but not enough to justify that.