Developers want more power. More power means better looking games, more intelligent AI etc, etc and the potential for far better games overall. The consoles with the oomph are the ones the developers are likely to support with in turn push up the sales. This is evident from the way many of them dismissed the wii u.
The wii sold a lot of consoles without third party support but it is looking very likely that this underpower console thing that nintendo insist on doing isn't going to work this time around.
The truth is processing power rules with the developers and it is has always played a part for the consumer, seems this will be the case even more next gen.
BTW I do not believe developers when they say PS and xbox regular game prices will stay the same next gen anymore than I would a politician telling me that my taxes and the cost of living will stay the same next year. I simply do not believe it.







