Nearly every one of them has spoken of the tyranny/dictatorship of Speaker Boner, and they want that to end.
While party discipline is a fine thing, it is un-American to punish dissent from the Speaker's chair.
If I were them, that would be prime concern. I haven't seen where Ryan has addressed that.
Ryan seems to have at least implied, “My way or nothing.”
Seriously? Speakers punishing dissent is as American as a baseball pie. There's never been a Speaker, certainly not an effective one, that didn't enforce dicipline.
Ryan is saying just that. If the Freedom Caucus buckles they will simply get a more forceful Boner.