Well the Gaikai is only in effect for PS4 and Sony platforms. I'm not sure if Microsoft will implement a similar service for the Xbox One but yeah they will stop making 360 and PS3 games sooner or later (give it a year or two after the Xbox One and PS4 release) but it did take a while before they stopped making PS2, Gamecube, and Xbox games even after the Wii, PS3, and 360 came out but granted Nintendo stop publishing Wii games like literally not too long after the Wii U came out.
Guess well see it would take a lot more then just not having anymore new xbox games being developed for me to jump ship