Perhaps the question to counsel needs to be whether any of the existing PICs are inconsistent with the new Mission language being proposed. (Answering this question likely requires a combination of legal analysis and understanding ICANN policy, along with neutrality as to outcome. Also, answering this question may take quite some time, given the number of PICs. Perhaps specific PICs can be nominated as those most likely to cause concern or needing resolution.)
If I understand the consequences of the CCWG proposal correctly, this means that (i) any existing PICs that are inconsistent with the new Mission language are being saved only by "grandfathering," and (ii) the same PIC would be prohibited in a Registry Agreement executed after the effective date of the new Mission language.
By the same reasoning, any new PIC would need to be judged against the Mission limitations on a case-by-case basis.
Greg