It's not a bad idea.
These leagues existed in the first place due to heavy popular demand, and it all started with minimal schemes like BnG/Elite/Roper/Team17 and slowly over time schemes were added one by one after being proven popular enough throughout the main leagues in WA.
Even Free League is pretty dead right now, are there enough people to make all these schemes active and worth it?
I don't know, most of the schemes I wrote are not very known, but the idea would be a league with only different or new schemes. Schemes that most people don't know. It would be good to make people try new stuff.
Other names I thought: 3.8 League (only 3.8 schemes), ESO League (only Extended Scheme Options schemes), RubberWorm League (only RubberWorm schemes), Alternative League, Scheme Promotion League, Rotative League (the schemes of this league would change periodically, with short seasons), etc.
The idea may "
flop", but since we are in a "new era" I think it worths a try.
Like in other games such as League of Legends, Clash Royale and Hearthstone they release often new gameplay modes to people try, some game modes people like, others don't. They do this to people don't get bored of playing, it is good to play variants from the main game sometimes. In league of legends there was a game mode called Dominion that never made a big succes (and one day they removed it from the game, only introducing it rotatively sometimes), but ARAM (All Random All Mid) was one created by the players that became an official very popular game mode. It was not played competitively, though. Another game mode that people loved but only appeared rotatively and not competitively is URF (Ultra Rapid Fire). Later TFT (Teamfight Tactics) become an official mode.
It is hard to make a new variant that people like and play, but at least we could try. If people don't discover and try new ideas we will never know if they will like in fact. If the schemes receive a proper league, maybe people will try them, I don't know. Particularly, one thing I liked about Worm Olympics is that new schemes were often appearing there and even these new schemes received special icons for the medals. You can still see the replays of these alternative schemes that are stored on the website, this is nice. In TUS we do have new schemes being hosted in tournaments or even in cups, but I still think WO was more receptive to new schemes, people also usually played more the new schemes, they used to host alternative schemes that appeared in previous WOs, sometimes during the same WO these schemes were hosted many times. In TUS the chance to a tournament "flop" is higher I think. Maybe because in WO people were crazy about winning no matter the scheme just to receive more points and stay in first positions of the whole event.