@ssj12, you would be a fool to assume that both sony, and nintendo do not also have consoles in pre-production.
though i do doubt we will see another console till 2012 at earliest i favor 2015 as the start date for the next gen givin development time. the even spread of software sales with all parties looking to make good money. starting sometime next year sony (by summer 09) should turn hardware profits.
it does not benifit any of the makers to switch too soon and loose a cash cow. further I belive if they change systems before 2012 they will dreamcast (I did love the dreamcast, but to many systems by sega too soon hurt it out of the gate) their system devs will abandon it and it will suffer a slow death.
Now thats not to say that no one will offer revisions to current hardware, that almost obviousl will happen
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