The last game I played with Brons he got to a point where:
his bank loan was exhausted, he had little/no cash, his expenses exceeded his profit.
this meant he was dead in the water.
we need a way to help this player end his misery by "declaring bankruptcy" if he is in the situation for more than so long.
in this situation he might be able to "Declare bankrupt" or the game could force it. One way to deal with this is to make the companies shares really cheap - so others will inject some cash when they buy the shares.
Another way is via a forced auction of the company where the other players bid for it, if no 1 bids for it, all assets are sold and destroyed!
what about in coop? a forced liquidation might be needed.
also consider the company might be better to sell a lot of its assets to get some cash and rebuild a smaller profitable venture. this is what makes forcing the players hand troubling.
this needs some thought!