If both consoles resemble one another in terms of "power", then it might happen. But i think it will depend on how successful both consoles are ad what type of games will come out for both consoles.
As for the next gen consoles, seeing as Xbox360 and PS3 are 5 years old at least, it`s safe to say that, at least, Wii2 will be better. But i honestly don`t know if the next Xbox or the next PS will be that much powerful than Wii2. What these last 3 generations have proven is that the winning console (sales wise) wasn`t the most powerful, so, you don`t need to have the most powerful console in the market to succeed.
I think that next generation there`s a high chance that both MS and Sony won`t bring overpowered consoles. Bringing a Xbox360 2.0 and a PS3 2.0 might be a safe choice financially since they could market their consoles at a lower price tag; still being superior to Wii2 and help keep game production costs from skyrocketing.
