I think some of these arguments trying to paint GP as some bad deal are pretty weird.
I do agree that maybe the quality of the 1st party output might decline, or that these games might adopt more GaaS like properties, but that's not a given of course.
At best I can see Sony offering their F2P games (PSNow does offer streaming after all and on devices not the PS5), their MP only titles (e.g 'TloU Factions') or the competitive MP if their narrative games (e.g. UC MP and not UC SP) day 1 (and permanently).
But as always, it makes little financial sense for them to do this for their AAA budget games, especially considering how well their IP's are beginning to sell.