I set a rule for myself a few years ago that I wasn't going to buy any hardware for only one game. Among other things, this meant getting rid of the 360 (which was pretty much just around for Forza).
However, I visited a friend with a PS4 recently and we played a bit of The Show 16.
I'm planning on breaking my rule and buying a PS4 and The Show 17 next month.
There are a few other games I'll likely get, but nearly all of them are also available on PC, or else stuff I wouldn't bother getting a PS4 just for them (e.g., Sound Shapes). I'm not sure I'd ever want to limit myself to only a single game/series, but if I did, it would be either The Show or Civilization. I'm not even a huge baseball fan, but the game is so good it doesn't matter.
So, yes, I'll be buying a PS4 essentially just for The Show

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