Veronique de Rugy is worried that Romney / Ryan's talk about "protecting Medicare" means that they won't really push to reform it.
The only way to ensure that Medicare is there “for my generation, and for my kids and yours,” reform it. If when Representative Ryan says “protect” and “strengthen” he means “reform Medicare,” great. Reform can take many forms, obviously. But, then we can believe Ryan when he says “ladies and gentlemen, our nation needs this debate. We want this debate. We will win this debate.”
She lays out all of the reasons why Medicare desperately needs to be reformed, if it's to survive at all. It's worth a read, especially if you're not convinced about the necessity of reforming Medicare.