The Republicans are all over the media with criticism. I don't see them pushing any courageous alternative plan. I give kudos to Weyden for taking the issue seriously but most politicians will dance with the ones that brought them to the ball.
It actually takes libertarians and progressives to see a courageous stance on something that would save piles of money- allowing the reimportation of pharmaceuticals, for example.
If anything, it is likely that Dems will lose seats if they don't pass a bill. That is what happened after Clinton's failed attempt and that is why Repubs are focused on defeating the bill.