The GOP doesn’t realize they are dead. If none of the three primary candidates are standing by the pledge to support the party nominee, there is no party loyalty. If the rules are being changed to circumvent the voters as well as the candidates, why have a primary - just go straight to the convention and have a nominating committee. Because of social media, more people than ever are seeing the corruption on display and learning about the tortured, twisted rules of the Republican machine that keeps power away from the voters. All the secrets are coming out.
The GOPe are loyal only to themselves and their agendas. Party loyalty is something they sell to the masses to keep them in line.
The GOP made a big deal about how Trump should support the party nominee. They had no intention of supporting the nominee unless it was Jeb!.