no one will take over proton when they don't get the controlling stake + decision making to turn around the company

I believe any company can also make it depending as to how decisions are being made.

If the staffs are delinquent and frequently causes problem, then fire them lar.

If you pay good money for parts but lousy quality, change supplier.

Proton's problem ? self-propogated - it is not impossible to solve them provided the decision-making lies right at the hand of the right people.