Not a chance. The GOPe is terrified of what might happen if they give the nomination to someone other than Trump or Cruz if they both legitimately fall short of 1237. You can smell the flop sweat in their pathetic flood of articles justifying not nominating the voter's choice. They're holding their noses and supporting Cruz because it's their last chance to stop Trump. If they could just rewrite the rules at will Cruz wouldn't rate a second glance.
Their contingency plan if they can't block Trump from 1237 is Hillary. That's a lot less dangerous than openly defying the voters.
So if Trump wins the nomination, the GOPe will funnel a Billion dollars to Soros... Soros will run a Billion dollars worth of anti-Trump ads all over the country until November... and when Trump loses to Hillary, the GOPe will claim innocence, and say "I told you so" to the voters.