Just a few points. Cloud gaming technology has moved a long way with companies like Gaikai, who Playstation has since aquired and are launching very soon for their PS4 Network. 

Companies like Nvidia have put huge resources into technology for supporting cloud gaming with such systems as Nvidia Grid. Tie it together with a decent network, and there have been extremely positive results where the latency of your screen starts to become the limiting factor. 

Subscription services like this are great for many people who dont want to spend a huge amount on a game. With processing done by the provider, you dont have a high up front hardware cost to run your games, nor do you have the high per game price tag to deal with. 

This service Aircade, was actually tested over mobile data with great results which many people got to observe :)