Trump losing Utah won't cause the race to move to the House. At this point nothing really will.
All Hillary has to do is win the states she's going to win anyway and she's got it. Trump can win Utah, Ohio, Iowa, Florida, Nevada, North Carolina, Georgia, Arizona......and she still wins.
Of course, there's no way he can win North Carolina, Nevada or Florida. Looks like Georgia is gone, too.
There is very little that their campaign could be responsibly doing at this point. Why not stake it out in Utah and see if they can stop the McMullin surge?