I wouldn't worry about it.
If they make changes to the game that lowers the performance on PS4, there would be soooooo maaaaany more PCs-that-currently-play-the-game that would be impacted much worse that such a thing would be a community destroyer.
Yes, it's quite possible to make a PC with better performance than the PS4, but the vast majority of PC players do not have such PCs. The vast majority is probably right around where the PS4 is anyway.
