I guess the crux will be the meaning of the word "authorized". If Hasbro claims the OGL 1.0 is no longer authorized and can convince a court that this totally normal and OK, 3rd party vendors will have a problem.
They would also have to convince a court that Paragraph 9 is intended to be restrictive, rather than permissive. Nowhere does it say that only authorized licenses can be used, and it seems obviously wrong for a license to preclude its own use.
Unfortunately, it costs a lot of money to prove what is obvious in court. WOTC and Hasbro are counting on their money and lawyers to have a chilling effect.