This is completely possible but it's going to fail for a number of reasons. 1 - People like to have hard copies of their games. 2 - If this system becomes a reality why would a publisher give their game to a third party to sell when they could easily setup a competeing service themselves? There's no patented tech here people. 3 - This will take masses of bandwidth, i'm assuming around a constant >3Mb. ISPs already enforce fair usage policies on heavy internet users, if gamers start having to constantly stream to play their games then their internet usage is going to become massive.