Unfortunately it has only survived and not succeeded due to...

Unfortunately it has only survived and not succeeded due to managements incompetence, hence why after so many decades proven they cannot get the job done. They should do the honourable thing and step down to allow someone to come in that will take it to the next step. Option number two is, no one puts anymore money into the company, the account dries up and through attrition tactics they are forced to move out or work for free. Once they move on (and retain their vested interest through shares) then there are a lot of investors willing to re invest more money to get the project completed. They just won’t invest into current management after decades of giving them money for promises that were never met.