A comparison of the current V6 turbo hybrid against V8/V10/V12: https://www.youtube.com/watch?v=ul8ZUBdHCPA
Not possible. We're in the cost-cap era of F1 and teams spent way too much time and money on those turbo hybrid V6 engines to suddenly bin them and start developing hybrid V10s along with new chassis that can accommodate them.
It would have been cool though, but not economically viable in the current era. The sunk cost fallacy.
The big teams who actually develop the engines aren't actually short on cash
Yeah, maybe Ferrari had unlimited moneys for V10 development, but for Mercedes Daimler already is skeptical about the benefits of the F1 program, and Renault's engines just suck this season, and Honda left the F1 program in 2020 then decided to not leave just for Aston Martin but would have probably nto been the case had they needed to switch to V10s.