It's unlikely that the transition to ‘company with audit committee’ will enhance the supervisory function, but it's likely to speed up the decision-making process by delegating authority to executive directors.
Instead of achieving 30% female board member and moving to Company with US-type 3 Committees at once, Toyota will implement Toyota's way firmly with BOD that is half independent directors.
The only way for Toyota, which faces several governance challenges, to uphold tradition of Toyoda family being at the top of management is to make the returns expected by investors.