That was me - thanks for not posting and giving me a chance to
I took the same trend (rare exclusives) and came to the opposite conclusion: diversified consoles. My thought was that the "lesson" of the Wii's disruption of the market is that more publishers will reorganize to become more agile - do more projects with small-to-medium-sized budgets, and stick to proven franchises for their big blockbuster hits. I think EA has tried to reorganize to become more agile; I think companies like UbiSoft and CapCom have been rewarded in the financial markets (stock price performance) because of their agility and ability to capitalize quickly on the Wii.
This is all assuming that the install bases are comparable, with HD consoles v. Wii being within 10-20% of each other's overall market share. (I'm grouping HD consoles together for the sake of this analysis.)
If the Wii becomes a runaway success (>=70% of overall market share at some point), then obviously the "blockbuster" game model may become truly endangered. If the Wii fades very quickly (<=30% of overall market share when its sales slow down dramatically at saturation), then the "Indie" game model may be endangered.
I find myself torn - I am a fan of both blockbuster hits and Indie projects. I would like to see a market where both types of games will thrive.
I just view it as the more money you spend, the more conservative you're going to be. You might see a lot of value added for one console or another, but the core experience for the game is going to be relatively the same. You'll see lots of exclusive bonus content, but not a lot of exclusive games. The Wii is a little different, because the budgets are smaller, so there may be some more risks taken. At the same time, it's getting smaller budgets, so the production values won't be the same.
I think the next gen consoles will probably follow the same trend. If Sony and MS want to continue battling for the big budget console, they won't rock the boat too much and they'll target price and timing of release a little better. Maybe Sony and MS will release 2nd consoles to compete with the Nintendo for the "casual" space, if it looks profitable enough.