I think it would be simpler and much more straightforward to just do realtime environments. Prerendering requires them to do this same work anyway, but with additional steps to get the renders working. Look at REmake remaster- they had a few realtime rooms that they remade for that game, which was very cheap and had barely any budget. If doing prerendering were cheaper, they would have done that.
This is one element of the originals that was due to technical limitations; the PS1 just couldn't pull of good enough realtime visuals for the games to have atmosphere. This was true for later systems as well, up until about the PS360 gen. We can now do realtime visuals that are hard to tell apart from renders, and character models already have so many polygons that any increase provided by prerendered backdrops won't be very noticeable... It's just not really necessary to do anymore.
There would only be one benefit from prerendered visuals, and that is that people with weak hardware could get high end visuals easily; the game could run on Switch and look very similar to a high end gaming PC. But I don't think that's reason enough to go through all the compromises and complication that static backgrounds bring. The game could be much more interactive and realistic if everything were realtime.