Are you sure that the loss of market share is due to mismanagement? Could it not be due to a competitor with unfair advantage? I mean the fact that even MS stopped their own development would suggest that to me.
So the concrete point you have against management: it is expensive. Does that explain the current situation? What if the CEO had a 300k salary, would that fundamentally change anything?
Edit: as a metter of fact, I also believe that a change is required, but I would look at the funding side, to diversify it. I would look into government funding (multiple governments), license merchandise, ask for individual donations, partner with more companies to sell rebranded versions of their products/services like with Mozilla VPN, etc.