I am very much afraid you are correct.
The Republican Party once again has squandered the Golden Opportunity given to it by the voters.
I have stated since election day while most were obsessed over Hillary, that she wasn't an issue. All the Republicans needed to do was what was promised in the campaign and she was toast. I stated re-election was dependant on Republican action, not on fear of Democrat's mythical powers. A lot of people preferred to fear the Mrs. rather than realize what the true threat to Republican Majority was. Now people are waking up, sadly, because it's proving very accurate.
They will be the Minority and it isn't because Democrats called them mean names and tricked us simpletons into believing wrong was right. It won't be because the country is tilting Leftward. It will be because Republicans cannot keep their word. And why can't they keep their word? Because they are spineless jellyfish that care more about fixed polls or the cover of the NYT's than they do about listening to our wishes that they do what is right.
I can tolerate policy defeats. I can even tolerate dissent. I cannot tolerate wimps.