Plurality of delegates doesn’t count at the convention. Majority of delegates does. After the first ballot, half of the delegates are released to wheel and deal. After the second ballot, if no one can get a majority, the convention is wide open and the oligarchs start their bidding and picking. Surely both Cruz and Trump know this, and Cruz is smart enough to know that establishment hates him more than Trump. I have no idea how this will play out, but if the nominee is not one of these two, I see gunfire in our future.
Perhaps that time will come but I think the most likely outcome for now is that there will be a lot of hand wringing and gnashing of teeth that may lead to isolated pockets of violence that the 0bama Gestapo will rapidly put down to allow for a 'peaceful' transfer of power to Hillary.