Shouldn't they be negotiating a workout that allows us to win the next election?
Barring some UFO attack or something like that, Obama is the nominee. Clinton is not. If she refuses to concede, she'll probably never get another shot and have to resign herself to being a female Ted Kennedy. If she refuses to concede, she and her surrogates will have dirtied up Obama pretty good. That could lead to defeat. We want to avoid defeat at all costs.
Ideally, she should pack it in and Obama would pick someone else as his running mate and they would win. This is not an ideal situation.
Clinton and Obama should work out a deal for her to either be Veep or get some delicious cabinet post now, and then he can win the rest of the primaries and we can win the general.
Part of the deal would have to be muzzles for Bill and Carville, et al.
This is not the perfect solution. This is not what I want. But sometimes it's better to win the Presidency than be perfect. It seems to me that the hammers are on both candidates. The biggest hammer is that they need to do this now, in advance of Pennsylvania. After Pennsylvania, Clinton's leverage will have diminished, and Obama will have lost a big state.