In any case with intel been... well intel, it does not matter how many players we get in the GPU segment, I think we gamers are still long away from seen fair gpu prices back, if ever again.
As for GPU power requirements, thats something we may have to wait till we get the real product and see some benchmarks and test. After all if 2x the performance for extra 55% more watts than current top gen (more or less), it does not seem too bad of a deal. Don't get me wrong! it is of course not great or ideal for people like me that care a lot about power usage.
But If you just want, like me, something better (performance wise) than for example my current card, we may be able to get it with a decent power usage, if things get better with stock and prices on next gen.