With Xbox One X, Microsoft Is Killing Console 'Generations'

Microsoft is looking to make the Xbox like the iPhone. No, they won't sell a new one every year. But they will sell them more often (every 3-4 years probably), with system software, apps, and games all working across the last several models.

https://motherboard.vice.com/en_us/article/with-xbox-one-x-microsoft-is-killing-console-generations