This is my opinion.......
Miners as a distinct group need to be removed from the equation. Mining needs to become a by-product of using of the Bitcoin system rather than the Bitcoin system being a by-product of mining, as it is now.
The three generals are still the only generals and they are now all sat in the same room. So who needs the messengers? (or the other two of the three generals?)
I try to figure out what you want to express. If I undrestand well, then you proposing dramatic change and rather proposing new cryptocurrency. I undrestand that centralization can be a problem, but Bitcoin is stable long term thanks to definition which is kept. This is how Bitcoin is build - thanks Miners.
maybe you can decentralized it via sidechain that can be mineable with gpu or other form of ancient mining, and still acquire token that can be directly converted in the blockchain in bitcoin, or something like that
just an half-assed idea for now, it may soun like altcoin, but it will be a bit different