Immigration is the big issue today. He's also made uncomfortable statements about assault rifles. I don't think he'd make the cut these days.
You are assuming he would make the same decisions today that he made almost 40 years ago. I wouldn't do that, it's a fallacy. Times change, people change, and you are referring to something that he did say was one of his biggest mistakes (the biggest being he believed Rats would give him spending cuts in exchange for a tax increase).
Stop listening to people who claim the GOP has become hopelessly reactive. It's wrong.