There is a simple solution: allow players to blacklist 1 matchup like you are able to blacklist some maps in the map pool. If Protoss is overpowered, let them play nothing but PvP’s. I shouldn’t be forced to play in an extremely imbalanced matchup unless I want to. The apetoss players will sing a different tune after months of nothing but PvP.
Personally I think there should be a feature on Battle.net where people can vote YES. If more than 2.5% of the population votes YES, it triggers a balance update were the system allows people to vote on what needs to be changed. The top 3 units are selected after a 7 day period of voting. Then there is a 7 day vote on each of the stats of these 3 units and the most popular option is selected. After the vote finalizes, it becomes the new version of the ladder that everyone plays on. This can happen as frequently as once every 2 months, so if a bad patch is made then players can rally, vote to 2.5% that a patch needs to happen, then vote to change the stats of the problem units.
More broadly, the Battle.net matchmaker should allow you to select what MOD you want to play on. You can select the “Popular” mod which is the one that everyone votes on, or you can play the “Starbow” one if you so choose. If Apetoss is ludicrously broken in the Popular mod, then don’t play it.