This is really reasonable, I don't think many people would object to this. Only complexity is the devs would have to re-write TG matchmaking for opt-in, but it's not rocket science.Need to do a few things:
Make the map pools opt in (3 map minimum to help get players matched easier)
Get rid of the 8 minute auto match whoever is queuing bullshit. (I'd rather wait another 5-10 minutes then be thrown into a match that has players with a rating range difference of 700 or more)
Fix the algorithm to weighted distribution and reset the ladder (yes this sucks because it takes months if not years for a ladder to normalise)
Make sure the game knows exactly who alt f4'd and only punish that player.
Remove the ability to play ranked using family sharing.
Have an option to also enable random positions alongside civs