Actually, if CDPR optimizes it properly, a 780 or 780Ti should still be good for a long ton of extra eye candy. Optimizing should not be understood as limiting what the game can do, but as allowing whatever hardware you can afford to throw at it to give you the best possible experience.
In the early days of Vista, a customer called in his field service rep and complained that Vista was using too much of his memory. The field service rep opened his computer, took out a stick of RAM, laid it on the desk and said, "There. Now that memory isn't being used."
The point being, optimization isn't about limiting resource usage or limiting performance to meet an artificial resource budget. It's about making the best use of all the resources available.