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I think this is solving the correct problem (few first-party titles), with the wrong solution (making the few first-party titles exclusive to PlayStation hardware.)
The problem is that there aren't many (and stagnating diversity in) Sony first-party games compared to prior generations, not that they've lost exclusivity (especially given that most Sony first party titles are timed-exclusives anyway.) Sure, not porting to PC might help with resource allocation, but you could have alternatively just had port-focused studios do that job, like the one they just killed after aquiring, and get most of those savings.
There is also a risk in that Sony probably doesn't have the market power to shift the trend of hardware-agnosticism for video games. They won't want to have an under-developed ecosystem on other hardware in the medium-term future (say, by 2033.) This sets them back.
Unless they can ramp up first party production and go the full Nintendo-route, chiseling out a niche, in that area - I can't see this retraction being much of a success.
