I believe you are right. I cannot see a Majority of Republicans in the Senate if they sell out their base.
The saboteurs have already lost their base. About all they can maybe save is themselves.
With shennigans like those that got Murkowski elected, with the bare-*ssed lies McCain and the minimcains told to get elected, why would people who want change even bother with the Senate? The real place to win is the HOR, with even more constitutional conservatives elected.