There is nothing to keep the municipalities from merging at this point. Cost will probably go up. One mayor, one administration but you would have increased fire department costs, police department costs, public works, etc....
It would stand to reason that the volunteer fire departments would go away( good luck with that ). The newly formed entity would have to pick up police protection for Mtichell and my guess is, police in GC make more than they do in Pontoon.
It might be interesting to have a study done. Of course someone would have to pay for such a study. Run it up the flagpole Elcooksta and see who salutes.