Osiris never said the bolded, you are coming up with that based on your fears.
The console was already struggling and the games were already "gimped" as you put it before anything was known about the ps4k. Uncharted 4 multiplayer runs at 900p. Battlefront and the Battlefield games runs at 900p. Look at FFXV, it's struggling with its framerate. Assassnis Creed Unity was so messed up.
Thanks to the x86 architecture, devs didn't need much time to start pushing the limits of the console. So you're right, yeah, that has never happened before for consoles because the architectures of the consoles have been some weird custom-stuf that it took developers years to get used to. The longevity of the ps4 is not really effected by this, if anything it has increased and is going to make this gen last longer.