Another GUESS Drew as this is the theme of this thread!
I suggest that if one of the current shareholders wanted out every now and again, then the others would stump up the funds to buy them out, alternatively they may attract a new investor to become a shareholder (likely to be a fan because it does not make good business sense under the current set-up). As long as the Board manage the finances so that we do not go back into administration, then everyhting will be OK (not sure what would happenin League 1 though).
If MM fails with city and wants his money back after four years it could be good by to the club (unless he finds another Gaydemark). he could sell-off anyone worth selling, asset strip where he can (training ground, etc) and take the club into receivership. I hope he would not consider this, but we don't know do we?
The level of guarantees would be much greater with MM than with any of the other individual shareholders to match the level of risk (all eggs in one basket). It would make decision making very straight forward though!
Things have got to change one way or another, the fans are (generally) sick of the way things are, very anti the Board and Shareholders and the Board and Shareholders have had enough and want to get out.