Re: Preventing a dojo coup
Why don't you start a committee to open a dojo and have your sensei teach on a contract basis. If and when he doesn't show up, you maintain your own class.
To supplement what would otherwise be a laidback schedule, you may consider inviting guest sensei's or yudansha's to provide regular instruction as well.
Provided you lay down that basic kihon is done a certain way, you may find that the different instructions and teachers will open up the way you train and generate a constant dynamism in the learning environment.