Character Limit

I remember back when I first tried the game, thinking that 24 characters was a nice number, and that, quite probably, I'd never use them all.

Right now, after countless leagues, I've reached that point. And I don't even want to think about deleting any other character to make room for new ones. Sure I could buy new slots, but that doesn't feel right either.

Wouldn't it make more sense to continuously increase the number of character slots as new leagues come out, or give some option to get some slot back, say, when you reach level 100 in a character or get some other achievement.