Hopefully this was a very fleeting thought; when it comes to ideas about changing corporate structure you couldn't really come up with a worse one. It is a complete violation of the skin-in-the-game principle that has so successfully propelled capitalist society for more than 200 years.
If management aren't accountable to the wishes of people who have proven they can preserve or grow piles of money, there will be economic waste on a colossal scale compared to what we have now. Corporate management would be overwhelmed by fast talking con men.
Turn your attention instead to the forces that are making short term decisions the better ones. I'm no expert, but if short-term thinking has been going on for a long-term time then something is more fundamentally wrong than "gee, people with money must just be stupid!". People don't seem to like accepting quite how rationally intelligent markets are - the only thing markets have been shown not to do well is make sacrifices for moral reasons.