Since Sony is in seriously bad weather they may even delay bringing a next console to the market.
The Microsoft plan sounds really half-ass to me. Maybe i don't see the point yet, im a slow learner they say ;P.
Anyways, as i think next-gen isn't really nescesarry at the moment (yeah that's just personal) sony might be able to profit from the early release of the next xbox and continue to dominate 'this gen'. I don't know if developers will buy that. It would make room for more smaller companies to step in on the market and maybe we get to see some gems like in the days of old.