I seriously doubt it's going to make any difference in this case. The Mormon church is pretty effective in mobilizing voters. In a caucus, where church leaders will be on hand to guide the voters to the appropriate selection, Utah is a given for Cruz.
If anything, I'd wager that the online voting screwups will work to Cruz's disadvantage, since Cruz no doubt had volunteers working to register out of state missionaries and retirement homes by the scores, since they would be unable to caucus in person.
I will consider it a major upset if Trump/Kasich even keep Cruz below 50 percent.
Interestingly, there is a sizable... and growing... ex-Mormon population in Utah. People have to officially resign from the Church to be out of it formally... they can't just stop attending, like a normal church. But I suspect that community will be voting in the democrat caucus.