Impossible to know without the specifics ...
You would almost certainly have to buy an AMD GPU to be able to run PS4 games and then we have potential interfacing issues too with memory and interconnect ...
Ignoring these issues yes I would be buying the PS4 OS as I am primarily PC gamer but it still wouldn't make the PS4 not worth buying to many out there who don't want to deal with the DIY PC BS ...
If that happened the PS4 would be no longer worth buying to ME ...