Onlive might serve as a catalyst for the reinvention of the current videogame business model, but for now it's more likely to prove unable to gather the necessary momentum before it collapses. What lies beyond the tech has always been the more interesting aspect of it, but the implementation still remains to be the groundwork without which it can't realize its potential. The infrastructure fails to keep up with the concept so far, and the investors may not have the patience and money to keep it going until it becomes self-sustaining.
Also, there's the great risk that it turns out to be a dead-end, with people preferring to own their games in a more physical form and on more fixed terms. But to find it out, they still have to build it first...
My gosh that's a pessimistic outlook you have there.
I think that OnLive has already been 'a success' considering the nature of the technology (the concept has been proven to 'work' despite all the doubt), and it will only get bigger from there. But of course time will tell.