That would be pretty stunning if Trump wins Utah by 30 Points in a State with a high mormon concentration.
It seems like the GOP base in UT has somewhat shifted on Trump and MAGA over the last few years. I'm sure that also played a role for Romney's decision to not seek reelection. Because usually he should have no trouble getting renominated at all.
Iirc UT has a weird convention style nominating system that may overrepresent the MAGA crowd.
It's tough to say whether Romney would've been renominated had he run...if I were him, I'd have retired on my own terms, too, rather than run the risk of ending my career with a disgraceful loss. Anyways he's like 75, so there's a small possibility he retired for personal rather than political reasons in the first place.