Except the current generation of games was designed for the xbox one / ps4. Now we have ps4 pro and xbox one x. So unless developers will stop developing for these platforms next gen ip will hit those two consoles and if not the ps4 pro then certainly the xb one x .
Pro and X are nothing more than mid-generation refreshes. Once first party developer support ends (and the vast majority of triple A third party developers as well) 2 years after the next-generation launch, the PS4/XB1 base platforms and their mid-generation refreshes will be a playground for late cycle titles and indie wares.
So, what's the problem?