In the big arc, maybe you have a point. Has conservatism lurched right since Nixon, and even Reagan? Demonstrably yes, in many areas, But today's conservatism is arguably in line with a much older strain of conservatism, where only propertied white men are allowed to vote, women's rights are severely restricted, and most black people are enslaved. When viewed in a larger time frame, I do see where one could argue that today's conservative movement has actually swung back toward its roots. (You'd have to ignore, of course, that attitudes on abortion were far more liberal back then.)