If you like japanese gaming and movie games, you might like the system. Great third party support as well. But if you enjoy playing online, can tolerate an unergonomic controller, and care about backwards compatibility, you might look elsewhere. Also, the premium ‘Pro’ model is middle of the road compared to Xbox One X and PC, but has better selection and power compared to a Switch.
Nice topic. I've been wondering the same thing. I'm moving to a new place and am thinking about using my solitary time on a PS4. However I just started playing PS3 games like Red Dead Redemption, X-com: Enemy Unknown, and The Last of Us. So I'm leaning more towards saving my pennies for a PS5 and the possibility of backwards compatibility.
There are a bunch of great games that are PS4 exclusive. Even if PS5 comes out in 2020, you shouldn't miss those titles! So my advice, get one and start playing them. Don't worry about the future, live moment.
I can't believe you haven't played GOW or Uncharted 4 yet.