Let's then take the argument that because Trump is winning GOP primaries in blue states by large margins that he puts those states "in play" in November. Trump got 60 percent of the vote in New York. That sounds great. But he received around 500,000 votes. Clinton got more than 1 million. Trump cannot win New York.
He also can't win California even if he prevails in the state's primary by a wide margin on June 7. Currently, Clinton leads Trump by 30 points, 59 to 29, in California. There is simply no way the state becomes competitive. Clinton will easily hold onto the core elements of the Democratic Electoral College base.
A better question is whether Clinton's huge advantages among women (53 percent of the 2012 vote) and minorities (28 percent) put traditional red states in play. Clinton leads Trump in Arizona and received about the same number of votes as Trump in the state's primary. Clinton also received more votes than Trump in the Georgia primary and polled very close to him in Alabama and Mississippi. She got more votes than Trump in Louisiana and Arkansas. Bernie Sanders received more votes than Trump in Oklahoma. Clinton got over 100,000 more votes than Trump in Virginia. You get the picture. Overall, Trump has received about 10 million primary votes to 12 million for Clinton.
Let's stipulate that anything is possible in 2016. A new, better, more presidential Trump who does not completely alienate women, African-Americans and Latinos could emerge between now and November. But we've seen how previous attempts to be "presidential" have gone for Trump.
Moving away from his core brand of uncensored attacks could also crush Trump's turnout among white men, who he needs to win in record numbers. Clinton could somehow stumble in debates (very unlikely) or investigations into her email use could take a surprising turn (also unlikely).
At bottom, there is very little reason to think the current picture — a very big Clinton win — will change very much between now and November. The GOP with Trump on the top of the ticket will probably go down to a Goldwater-type defeat and once again the Republican Party will have to try and reinvent itself at the presidential level.