Where's your evidence that the market has been even attempting to solve the problem of people (such as Musk) holding multiple C-suite positions simultaneously? I've seen no such evidence. If anything it seems to be supporting it, given that Tesla shareholders seem primed to vote on giving Musk 50 billion USD.
You're the one who claimed the market will solve this problem, the onus is on you to provide evidence for your position. Additionally there are plenty of cases out there of objectively terrible CEOs (Elizabeth Holmes comes to mind) that don't get booted out - it usually takes regulators or even the justice department to deal with it in those cases. Which is exactly what's being proposed.
