I believe a big part of Python's success is owed to Guido. However I don't think this is a good move. It's not very likely, but not impossible that this will even kill Python.
Doesn't he have any people he trusts in the inner circle of Python development? Would've been much better to have power slowly and uncommented slip into their hands. A process that could have been started years ago.
Feels a little like this: https://imgur.com/gallery/IYYmtqL