Trump has never been a Republican stalwart or even much of a supporter of the party. He seems to me (and this is just my opinion) to be using the party as his personal stepping stone. His strategy may work, but at what cost to Republicans?
Trump was on Hannity's show last night and while there was no Twitter storm, he did get some attention for an hour or so (Nowhere near as much as The Bachelor.) Half of the Republican tweets I read were furious that Trump might have told the New York Times his position on the undocumented was "negotiable." He responded to Hannity that everything is negotiable. Then he backtracked on that and said "the wall" is not negotiable. This group of tweeters thought Hannity acted like Trump's lackey, and that Trump's politics are indistinguishable from Hillary's.
The other half, who support Trump, loved that Trump insulted Fox News (telling Hannity the network had a lot of "bad people".) This half absolutely hates Marco Rubio and mercilessly bashed Ted Cruz.
They all seem more than a bit delusional. (One woman tweeted she'd love to have Trump over for dinner because she's certain they would have so much to talk about and have a really interesting conversation. )
How can this Republican meltdown mean anything but good news for Democrats in November? As bad as the Trump attacks are now, they will only get worse if he gets the nomination. There will be more and more reprints of reports of his "raw behavior". More journalists will re-investigate his claims of wealth and success and report their findings. (It's not really breaking new ground.) I don't expect that any Republicans who now back Trump, but later get disillusioned, will vote for a Democrat. But I do think they may stay home -- which can only be good for Dems.
Shot through the heart, so who's to blame? The talk about this will go on for years whether Trump wins or loses.