I agree. I think the way the hardware is, they will not have such long cycles now. If they were clever they could have even made an add on box for extra gpu power, call it a 4K box to render games at 4k.It doesn't have to.Already maxing out the hardware two years into its lifespan? I suspect this generation of consoles will not be able to last the seven years the last one somehow did.
It's more or less generic PC-hardware and can rather easily be upgraded.
Such concepts have a wretched history in the console business. More likely we'll see successor generations that use improved versions of the APU while remaining fully backward compatible. The new machine could be labeled 'Level 2' with accompanying labels on software that will only run on it. Some software will chose to go the scaling route and be labeled accordingly, indicating that not all features are available to Level 1. Less ambitious products will continue to target Level 1 and thus reach both generations.
I suspect we may see some improved models come out that don't change things from the developers' perspective. For instance, upgrading the USB host to 3.1 would enable much faster storage. Also, 4K playback for UHD Blu-ray discs and streaming services. Games would be rendered at 1080p or less and scaled on this inbetween generation. The improvements to the APU would be fairly cheap to add during a major die shrink (in transistor real estate terms, not the work required) and would lay the foundation for the successor platform that required separate development efforts to fully exploit.