When will Kerry start using debate debates as a political wedge?

President Bush is clearly leaving himself open to the "chickenhawk" charge by not responding to queries from the Presidential Commission on Debates. This is especially true in light of rumors that Bush doesn't want three presidential debates - namely, that he wants to avoid the second, town-hall debate.
Will Kerry hang tough, even at the implied price of junking the entire debate package? Should he?
I say yes. If anywhere is a key place of where he has to play hardball, and has potential big political gains, this is it. Period.
But will he? My odds are 50-50.