I think TV based gaming will change dramatically in the coming decade to 15 years. But tablets won't replace TV based gaming. Some evolutionary variant of Onlive will replace the traditional home console, though Onlive itself won't do it, unless it combines the likes of Apple / Android TV, web browsing, Skyping, etc etc.
Tablets are hopeless controllers for games, and a 10" screen can't replace a 55" screen for awesomeness in visuals, and tablet earplugs can't replace a surround sound system for awesomeness in sound. They occupy a completely different gaming niche with very little cross over.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
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