FWIW, I think Kelly (or Greg, for that matter) would actually be quite good at this. Part of Wikipedia's problem is that those at the top don't like listening to people who aren't positive about the project. Someone willing to say "this project is failing" and articulate enough to explain why – as opposed to some of the "Wikipedia is evil and must be destroyed" brigade – might be just what Jimbo needs.
Regarding my preliminary opinions of this particular proposal, to save people trawling through threaded discussions for them, my personal opinion on it is:
I'm sure everyone involved has the best of intentions, but this looks designed to become Wikipedia's version of the European Parliament; a meaningless, unelected and unaccountable committee with no formal powers, which ends up only existing to rubber-stamp and legitimise decisions. Maybe I'm being cynical, but the current list of members looks like a deliberate attempt to create sinecures for the noisiest critics of the current setup, on a "better inside the tent pissing out" principle. This just looks like Arbcom's revival of Jimbo's old arbitrary appointments without the need for anything messy like elections or selection processes.
No disrespect to the individual people who've accepted, but I really don't think this is a good idea from either angle; either you're a fan of Wikipedia in which case it's diverting your energy into a talking shop which Jimmy Wales will ignore, or you're an opponent of Wikipedia in which case the energies of critics are being syphoned off into this heat-sink page (as well as the blow to the credibility dealt by the critics of the system accepting an appointment to what looks like God-king Jimbo's
House of Lords.)