Rainbird on 17 July 2010
As twesterm said, Sony and Microsoft are trying to break out of their box. Time will tell if they'll be successful, but I think the control schemes they've come up with are something we're going to see more of in the coming generations.
I don't think they'll be locked down like you're predicting. They're certainly not suddenly going to jump to Nintendo levels of popularity in the expanded audience out of the blue, but I think they will expand into it eventually, whether it starts with games or other offerings.
EDIT: I forgot my actual point. I think Nintendo will remain in the lead, but both Microsoft and Sony will see satisfactory success as well, probably more so than right now.
