We will never know.
Mitt had the GOP/RNC elitists already. He has them now. He and they couldn’t get him the nomination. Blabbing about capital gains reduction vis a vis, say, Netherlands isn’t going to win you one state.
Mitt doesn’t and never will have the popular feel, communication, trust, instinct, so he can not get votes.
Besides, his economic ideas are GOP boilerplate, dull, known to death. That is a very weak hook.
I disagree. We have fluff now with a POTUS and administration who doesn’t really understand or particularly care about basic economic principles. It may be boring, but competence, not personality, gets the job done. It’s a shame the electorate is swayed by nonsense.