They won't even put a browser in the console because they don't want to confuse with the their PC market. It nice idea in theory but if cost them or be another loss leader, then the answer is simply no. Especially after the Project Natal announcement which will be a there new loss leader.
Face it, it anything, the only new console you will see in the next two years is maybe Wii HD, which will be something you described, and possiblely to often rumored Apple's IConsole.
Sony and MS are going laterally with the iterations of their consoles with peripherals, storage add-on, and controllers to extend their product's life. R&D won't be cheaper but it won't big loss leaders as new consoles (in Sony's case, still is) Don't expect any console hardware until 2012 from either of them.
I'm just saying...
