Get ready now for an adequate and vague speech by Palin that will, per the expectations game, be hailed as a triumph.
My guess is it just doesn't matter. There are several aspects of the last few days' coverage that will stick in the long term, even if the media coverage swings away from onslaught in the near term.
In fact, a short term boon for McCain in this might be a long term loss. Their best bet for damage control is a backlash to an ad nauseum media onslaught on Palin. The sooner that onslaught declines from its frenzied peak, the less likely a backlash is. In other words, they might benefit most from the pot boiling over. If it stays on at a steady simmer, they're basically fucked.
Of course I'd prefer that she totally screw the pooch tonight. But the dimensions of the pick are pretty much the same as they are now even if she doesn't.