What if the majority of Trump delegates (and alternates) fail to show up, while all the Cruz delegates show?
The nomination threshold is a majority of votes cast.
Part of the NeverTrump strategy is to get Trump and supporters to do really stupid things like boycotting votes or attacking otherwise friendly delegates.
Who’s going to explain to the folks back home why most of their state’s delegation wouldn’t show for a vote?
Parties aren’t a one-off deal. There are state and local parties that need money and volunteers. There are elections at least every two years that need organizations. Not everything is about one presidential election.
Most party regulars were around before Trump and will be around after he’s left office. There’s always work to be done.