I think the Xbox 360 will have more sustainability for a few more years. It’s not like the case with Nintendo where if they launch a new console, that they’ll immediately stop current production of previous console games to a halt. And considering how there’s a plethora of 360s sold on sites like eBay, stores may do trade-ins, which adds on to the longevity of the console.
And it’ll be a while before servers aren’t as “devoted” for multiplayer as well, since games last much longer solely because of that. If anything, the price will become cheaper so more youngsters can play older games. It saves the parents a lot of cash for their kids that would be content with any kind of video game. Even though sales with Xbox 1 is going good so far, it’s not enough to have retail stores like Walmart for instance to suddenly strip 360 away when I’m sure they have an overstock in general.