I can see having the team be asked to leave for unsportsmanlike conduct but not just because they are good. A good friend of mine had to deal with a similar issue, he simply suggested that the coach would be better off playing in another league so his team would be able to learn and grow. Didn't kick them out of the league, it turned out well the coach had kids that would have never pitched do so. My friend was very glad the coach was as interested in his players character as he was their playing ability.