My entire PS4 library is now digital with the exception of NASCAR Heat 2. I'll probably buy NASCAR Heat 3 (releasing 9/7) digitally once it drops in price and just delete 2 anyway. I enjoyed NH 2 a lot when it first came out, but it was hard to go back to after playing GT Sport. I'm not one to exaggerate, but the graphics and framerate are average even for a previous-gen console. I didn't realize how bad they were until I played a bunch of GT Sport.
Unfortunately, I don't think NH 3 will look much better if they're still using the Unity game engine to develop it.
GT spoils all the other driving games, the graphics are that good.