What I mean is just release all their players, leave them with nothing, then resign to watch them sink?
I did that with Falkirk after a horrible run with them in the First Division. They annoyed me completely, underachieved, complained and moaned all the time, and couldn't get promoted after losing the last game. So I released every player from first team to reserves to under 18's and just watched them sink. Surprisingly they only managed to sink to the second division and promoted back to First, but they're always in relegation zone. And every manager seems to get sacked from Falkirk, quite amusing.