Bloodborne is out today and plenty of people have been asking me: "is it worth buying a PS4 for?"
I don't know. Depends how much money you have!
Is a single game ever worth buying a console for? I don't know. I think not. But in my experience I've tended to buy consoles for a certain game and then found myself enjoying other games. I bought a GameCube for Wind Waker, for example, then found myself loving all different sorts of games on that console. I bought an Xbox for Halo and ended up enjoying Morrowind and Splinter Cell. Long story short: there are usually a ton of surprise games on consoles that surprise you.
So I'm going to go with yes. It's worth it in the long term. But only because there are other games out there.