I don't believe the future of gaming is in streaming(as least as primary), unless you mean owning the rights to a game and access it (ie going pure digital download). But if you are talking gaming will go the way of say Netflix I would say you have drawn a false equivalence between movies/tv and gaming.
Certain genres may trend towards streaming (I could see sports games going this way) but most others will not.
I say go back 15 years and go to blockbuster. They rented games, movies, tv series on DVD or VHS. But games were never never their strong point, certain types of games were seen as rentals for sure, but generally speaking renting games was never very popular. So while tech has changed, consumer preferences really don't that much.
People never wanted to own every movie they watch, so Netflix or digital rentals completely satisfies them. People want to own their games, yes certain games they just want to play quick or just try out and would rent.
I see the future of gaming going digital, but streaming. Naw. It will have its place, but it will not be the preferred route. I get annoyed enough with online only games that I enjoy and then cannot play because internet or servers are down. It would be highly irritating if I could not play any games unless my internet was always 100% up.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut
