IMNSHO, if these parts of the challenge are not changed, there isn't a chance of anyone "famous" accepting the challenge.
At JREF, we offer a one-million-dollar prize to anyone who can show, under proper observing conditions, evidence of any paranormal, supernatural, or occult power or event.
http://www.randi.org/research/index.html
According to that, if I can show, under proper conditions, evidence of a paranormal event, I get a million dollars. (Whoohoo!)
But when you get to the actual "rules", I can't.
This is the primary and most important of these rules: Applicant must state clearly in advance, and applicant and JREF will agree upon, what powers or abilities will be demonstrated, the limits of the proposed demonstration (so far as time, location and other variables are concerned) and what will constitute both a positive and a negative result.
http://www.randi.org/research/challenge.html
So instead of demonstrating "a paranormal event", now it is what "power or abilities" will be evidenced, and it is restricted to one person, demonstrating their "powers or abilities". In no uncertain terms can anyone apply, unless they claim to have some ability. And the same person with a "power or ability" has to do all the negotiations, jump through all the hoops, answer mail, write stuff up, spend months trying to come some kind of agreement, as well as show up when and where Randi or others demand. You can't have a lawyer or an agent handle the legwork for you, much less apply.
This is not how the world works. While you might get some fruitcakes and nuts trying to do this, nobody with an income, an agent, and a reputation is going to do it, especially considering the extreme hostility of the JREF, in the person of James Randi. (don't scoff, it is in the FAQs kids)
Even if changes are made to overcome that, then you have the real deal killer.
Applicant agrees that all data (photographic, recorded, written, etc.) gathered as a result of the testing may be used freely by the JREF.
http://www.randi.org/research/challenge.html
Considering that the first e-mail or print letters, as well as the challenge applications, are published online, along with hostile commentary, I can't see a public person submitting to the challenge, or even asking what would be considered a fair test. Or, assuming somebody is insane enough to go through a six month conflict working out the details, and actually demonstrates something, anything, any part of the results can be used however the JREF or Randi chooses. Forever. Over and over.
Win or lose, the JREF has media rights to everything.
But all this is moot, AFAIC, because the very definition of paranormal or supernatural, is that it can't be demonstrated, repeated, verified, or recorded. If those conditions are met, it can't be paranormal, by definition.
Yes this is waved off as not an issue, if Randi says it is supernatural, you can take the challenge. But defining what is the event, and what would be proof, is the very heart of a challenge.
Just more thoughts about the MDC.