You completely missed the second part of my post: "The whole hiring process could be replaced with a timely renewal of accreditation."
The accreditation would be available to anyone. Just like anyone can become a lawyer in Japan for example. You don't need to hold any diploma for that. Although it might increase your chances to get accredited if you have formal education.
Fair enough, that does address the point about hiring seniors.
But if universities can't currently usefully certify people for fundamental development ability, after having them on campus for years, i don't see how they'd be able to accredit seniors for the more complex skills they need.
The accreditation would be available to anyone. Just like anyone can become a lawyer in Japan for example. You don't need to hold any diploma for that. Although it might increase your chances to get accredited if you have formal education.