If there was a league for every scheme, or if people were allowed to host their own league even with a limit, I don't think it would improve the activity on worms.
Correct me if I am wrong, but didn't you suggest, or at least support the idea that Chicken23 had within the last month, of letting players play whatever scheme they want in TUS League?
Honestly, what is the difference? I'll tell you a major difference I see.
If you allow any scheme to be played in 1 League, the players who play the most popular schemes will be at the top of the standings, thus, shunning the players who enjoy playing less popular schemes in a League making their time feel wasted. One of the main reasons to play a League, is to win, and you can't ever reach the top if nobody plays your scheme.
But, if you allow players to host their own Leagues, at least those who LOVE that scheme can join, and have a better chance of reaching the top, thus creating more pride/respect and a reason for even competing!
I am not an all-rounder, I don't ever want to be, so I won't ever take part in TUS Classic, there are HUNDREDS of people like me.