In his latest piece at the American Spectator, David Catron predicts that "The Employer Mandate Is a Goner".
In particular, he notes growing chorus from thoughtful people on the political Left (as well as the Right) arguing that it will cause serious economic harm. Whether this will translate into legislative action is a separate question, of course. But it's a good start in the right direction.
(For more details, read the full text of "The Employer Mandate Is a Goner".)