You are correct. If the R party holds 46 Senate seats, the party won’t pay attention to other opinions. If the R party desperately needs more votes to even hold on to their cherished seats, let alone win more seats, then the other opinions will get their attention.
Want to get their attention even more? Get to the sources of funding for these politicians. Find out who the big donors are and promote your point of view as better for them and for the citizenry on which their livelihood depends.
If the Tea Party types could hold together in a principled way and stay home or split votes against rinos, it will kill the big money donors as well. Donors aren’t going to spend big to support someone with no chance of winning. Ultimately, the rinos will have to do more than provide lip service to their base.