Kinda reminds me of what happened back in 2000 when the media declared Gore the winner in Florida, even though the polls in the panhandle were still open for another hour. That dirty pool dispirited and disenfranchised many panhandle voters from the election. Bush would have won Florida by a much larger margin if that had not happened.
There are several states, including California, that haven't had their primaries yet. The media (both liberal and conservative) and even FR are disenfranchising those voters by telling them that their primary votes for anyone other than Trump in the don't matter.
Now, if this "all Trump, all the time" policy is simply a case of learning from one's mistakes, then admit you were wrong for not lining up 1000% behind Romney in 2012 and move on. Admitting one's errors, repenting and talking about lessons learned might help calm the fire in the belly of a lot those who have supported other GOP candidates up to this point.
But if all that is offered is arrogance, bluster, bullying and zotting, then good luck with that.
Trump is the nominee. Suck it up.