I also think that Gomez deserves a chance at that RCB role, it seems almost tailor made for him if he can recover his form (which I appreciate is very much an if). Similarly, I've said before that Trent coming in off the left rather than the right could be interesting. Gomez could then effectively do the "Robbo" role from the right, starting at RB and shifting inside when Trent goes into midfield.
I'm concerned about relying too heavily on the new system. It's worked very well for a quarter of a season, but things change fast. I'd still like to see us get someone more senior than Bajcetic (despite his clear quality) who can push Fabinho, even if it's an older player who's later in his career and may not mind time on the bench.
I agree with your main point though, that improving higher up the pitch will automatically make the 6's job easier. Fabinho lost form, but did not become bad overnight - his job became more difficult as our pressing has dropped away so significantly at left wing (losing Mane), CF (Bobby playing less), and in the other two midfield positions.
I don't agree with this, though. If Bellingham is £120m, Rice is £80-100m albeit his contractual position affects that. I think Rice is exceptional and will shine in a big team. The one caveat is that it needs to be a big team which is functioning - if he comes into something like the Man Utd setup two years ago, he'll falter. If he went to City, or Arsenal if they continue their building and advance on what they've done this year, I think he's pushing Rodri as the best in that role.