No. They will third party or stay home.
In an ironic twist of fate, Trump supporters, miffed at their hero's failure to be nominated at the Republican Convention stayed home or voted third party, made possible the second Clinton Presidency.
When interviewed about the results of their actions, most replied that they were waiting for the next General Election (not likely to be held for eight years).
When asked how they voted in the two previous election which resulted in a two term Democratic Presidency which they all believed a disaster for the country, they all replied that they stay home because they didn't like the Republican candidate.
THE OLIGARCHS’ SUPER PAC ANTI TRUMP SAVAGERY [Buchanan]
http://www.freerepublic.com/focus/f-news/3406407/posts
Fully 116 members of the GOP’s national security community, many of them veterans of Bush administrations, have signed an open letter threatening that, if Trump is nominated, they will all desert, and some will defect – to Hillary Clinton!
54 Private Jets at Meeting to Stop Trump
http://www.freerepublic.com/focus/news/3407016/posts?page=61#61
[Link list on post 61]
If there is a brokered convention and they wind up choosing mittens or yeb, then yeah im staying home.