With how baseball has already been nerfed, what you're suggesting right now would end up killing the game for good. There'd be no point in playing it after that.
Also, by that second point, we should also nerf trading as well, because people can and do put hours of their time into that, and it earns far more than baseball can in less time. Especially after the nerfs to baseball Alex implemented previously.
As for your third point, what's stopping Coalition A from doing the same? Absolutely nothing, they can play baseball as well if they choose to.