You never "have to" fork out money for a product. The option is always there to apply a little self-discipline and upgrade less often. That same life skill will come in really handy elsewhere, trust me.
I've had a PS4 for - more or less - 6 months and I feel like this news somewhat undermines my purchase. If I had known that a newer, more powerful machine was going to be available so soon, I would have applied some "really handy" "self-discipline" and waited, much like I did before when I waited to jump gens until some decent games were out.