I said at the time of the debates the real third party danger was Bush. Needless to say, if Trump is the nominee, they won’t lift a finger to help him win. We’ll have to do that ourselves.
Once Trump agrees not to run third party the long knives will come out. They will all do everything they can to ruin him. As for me, there is nothing they can say about him or prove about him that would make me vote for anyone but him or Cruz.