A clean break between the TEA Partiers and the GOP would be a strategic disaster for the GOP and doom the TEA people to the long-term irrelevance that has been the fate of every third party since the GOP was formed 160-odd years ago. None of them have succeeded in doing anything more positive than gaining the odd Congressional seat, but many of them have had enough support to be the spoiler and ensure the major party closest to their own position comes in second. It's a long history of self-destruction, and at this juncture splitting completely away from the more conservative of the two major parties is pretty sure way to screw the pooch royally.
On the plus side, the odds favor taking the House but only getting into reliably-solid filibuster territory in the Senate and the slates are pretty well set by now, so if they were going to do anything so boneheaded in an excess of hubris and enthusiasm, now would be the time when it would do the least damage.