Depends what game changing if referring to. X1 will definitely sell more consoles now because its easier to sell a product to comsumers knowing you can play there old games on it. Once its up added majority of its 360 market games, that means the X1 has 2 generations of games playable with no extra cost. For Hardcore gamers it doesn't do much since they will buy games twice or the new systems straight away but for the casual gamer or the new gamer its an easy sell.
"Which console would you like, both have amazing games coming out, however one can play all your old games with the extra features of the new system, or you can buy the other one which you have to pay an online service fee and Stream your old games" There's a clear winner there.







