I think they'll all go closer to 10 years as MS & Sony will need a lot of time to recover all the $$$$ they've lost out the gate this generation.
I do not think Nintendo will come out with a HD-Wii in 2-3 years either. HD-TV owners are buying the Wii anyway, so why bother?
Plus all 3 have gone on record saying they don't want to start a new generation in 4-5 years. 3rd parties would rather no one did either as transistion periods hurt everyone.
That said, eventually their will be one. Could go in any direction, including being started by a new competitor to the field. Nintendo would be best positioned to introduce one earliest.







