Allow me to jump on the bandwagon. Whether it revolutionized debate or was merely a fad ratings gimmick is not the issue. Whether the questions were softball, ridiculous, or thought provoking is not the issue either. The issue is that Republicans cannot afford to reaffirm the "old white men who are afraid of change" stereotype, and skipping or being noncommittal over participating in a new debate format will do just that.
If two or more of the top four Republican contenders don't show up it's bad news for Republicans. If only one of the top four doesn't show up, it's bad for the absentee. Just agree and get it over with, you technophobes.
A Republican YouTube plea for Republican YouTube participation. (Plus, I think he's rather cute)