Yes, several Sony studios have been/will continue growing with the goal of being able to work in multiple projects at the same time.
But to grow studios to the point of getting a full aditional AAA team requires a lot of time. And to make a AAA game requires many years, specially with pandemic lockdowns in the middle.
In less than 3 years ND released TLOU2, Uncharted Legacy of Thieves Collection, TLOUP1, two PC ports, Uncharted movie, TLOU TV show and this month a fucking rollercoaster. They are supposed to show this year their biggest project ever: TLOU Online, which I assume will release next year. They are rumored to have other unannounced big project under development, which I assume is in early stages.
The TLOU Online project originally was only going to be a MP mode for TLOU2, but when was decided to branch off to a standalone game changed a lot and basically rebooted into a way bigger and more ambitious concept, the biggest ever for ND.
Insomniac released Spider-Man Morales + Remastered (and their PC ports) and Ratchet Rift Apart. They shown Spider-Man 2 today and announced to be working also in Wolverine, which I assume will be released next year.