I honestly think for the PS5 gen everything is ok despite wishing releases were more frequent. The important thing moving forward will be the next gen and in a perfect world, Sony would have a major first party release every quarter. The thing is it will take time for all the reorganization of internal studios staffing up to be more like 2 teams to really see that effect this current gen. However, if ND, Santa Monica and GG can effectively become studios with 2 teams ideally once the PS6 gen starts we get releases every 2 years from each studio.
When you factor in Insomniac who is already a damn effective 2 team studio, and with Sucker Punch in the mix even if they remain a 1 team studio, I think you could have a situation where every year you are getting 2 AAA releases from one of ND, SSM, GG, Insomniac or Sucker Punch. Then ideally you get 2 more releases each year from one of Housemarque, Bluepoint, Firesprite, Asobi, Bend, Media Molecule, and whatever Xdev projects are in the pipeline.
Again we won't see this in the PS5 gen, but if SSM, Naughty Dog and GG are able to ramp up developers in the hopes of being consistent 2 team studios, which appears to be the case from everything we hear, I think this could be achievable. However, a few more studios for sure would help make this more likely to happen for the PS6 generation, and I'm positive over the next 2-3 years they acquire a few more studios to get there. Furthermore, if 1 or 2 of the GAAS games truly do hit and generate a consistent revenue stream, you hope some of the other studios that had their GAAS projects not hit ideally move back to supporting single player games.