Bannon's an idiot.
Nobody wants to talk about the reality that the votes are not there for the full repeal that so many are demanding, and it's not because of juvenile conspiracy theories like "they all lied to us!" or "they serve other masters", or any of those ridiculous bromides.
It was obvious to anyone who has actually followed this stuff during the campaign that while perhaps 85-90% of GOP candidates fully supported repeal without preserving some specific elements, 10-15% did not. They would not support repeal unless there were guarantees that certain elements were kept, and for the most part, those people campaigned on that platform, and are holding to it now. And they are enough to sink any bill.
There is no betrayal. People are doing exactly what they said they'd do all along. It's just that now, when it is time for votes to actually be counted, we can no longer sweep under the rug the lack of consensus on a bill. We glossed over those disagreements prior to the election in the hope that they would melt away, but they haven't.
For example, Portman is my Senator, and he's never been in favor of repealing without "replacing" with some things that are anathema to conservatives/Freedom Caucus. I don't like it, but he isn't "betraying" anything that he didn't run on. It was just that some people saw what they wanted to see, and heard what they wanted to hear, rather than listening to what the guy was actually saying during the campaign.