It wouldn't end well for the GOP. Even if they just concede the presidential race, such a chaos, culminating with trouncing the presumptive nominee, would hurt them in downballot races.
Sometimes you have to put the country before party. I'm ok with conceding the Presidential election in this circumstance.
I'm not and you will lose folks like me forever if this kind of Democrat-like rule breaking is allowed to occur. Trump is the nominee. Period. Too bad, RINO Flake.
Political parties need to make decisions that attract voters. The Republican Party has made a choice that has repelled me (and Green Line). I guess true Republicans like you will need to make decisions that appeal to RINOs like us if you don't want to live in a country governed by Democrats in perpetuity.
The Republican Party is no CPSU. We have no obligation to do what it says. Neither do its Senators, thankfully.
The voters, including myself, enthusiastically voted for Trump. For the party elite to tell the voters that they don't matter will destroy the party. You'd never get voters like me back in the fold to vote for another uninspiring RINO like Mitt Romney.
And if the party chooses to act like crooked Democrats, they will reap what they sow, a crooked Democrat as POTUS.