This post is speculation. It assumes that Trump will lose and lose big in November and that the Republican establishment as defined by a variety of rules committees has the power and the will to institute changes to the Republican primary process to Trump-proof the process.
The easiest way for the Republican Party to Trump-proof itself is to stop lying to its supporters. The Republican Party elite is fundamentally not trustworthy to its base voters. The core example is the promise that a Republican House and a Republican Senate could force President Obama to unwind PPACA while he sat in the White House. That was not going to happen. Trustworthy elites won’t happen as there is too much money to be made from fleecing the rubes. Once we take policy honesty off the table, rule changes are the next step.
Trump is the delegate leader (and presumptive delegate majority holder once the process plays out) with a low proportion of the total vote.
Total votes, primaries
Donald Trump ——— 10.5M
All other GOP ————— 15.6M
— Dan Diamond (@ddiamond) May 4, 2016
He benefited from a split field and a rules system that allowed factional plurality leaders to amass delegate strength out of proportion to their actual vote counts. Winner take all elections with more than two candidates have this common failure. There were two sets of winner take all elections in this current Republican primary. The first was state level delegates where the winner of a state received a significant bonus number of delegates and then winner take all at the Congressional District level. The Republicans assigned three delegates to each Congressional District without regard to how many Republicans actually lived or voted in that district.
538 has a good example of how this flat allocation of winner take all delegates by district helped Trump:
If Ted Cruz wins by a huge margin in Milwaukee’s suburbs, as expected tonight, he’ll get all three delegates from Wisconsin’s 5th Congressional District, which cast 257,017 votes for Mitt Romney in the 2012 general election. But in two weeks, Donald Trump could capture just as many delegates by winning a majority of the vote in New York’s heavily Latino, Bronx-based 15th Congressional District, which cast only 5,315 votes for Romney four years ago.
Three weeks ago, Trump won three times as many delegates — nine — at the Northern Mariana Islands convention, which drew just 471 participants.
This is problem #1. The GOP primary delegation process favors plurality winners and it favors candidates who can win in very low turnout environments. There is a massive variance between the minimum number of votes needed per delegate and the maximum number of votes needed per delegate. Some districts are extremely efficient and some are extremely inefficient places to win. The Republicans treat districts like the Senate treats states. The first rule change would be to scale the delegate award to some measure of Republican vote strength.