My feeling is that there are way too many words being written about Donald Trump.
He's a joke who was helped to get where he is with minimal spend because of the fascination of the media with how far a joke campaigner could go. Now the media is full of "maybe he's not a joke after all!" semi-panicked writing from all and sundry, on the basis of a polling boost from winning the nomination. (Even though American polling is fraught with complications and a post nomination boost is not unusual.)
All this attention gives him a de facto credibility he doesn't deserve. Not only that, it feeds his attention seeking bad behaviour.
I would suggest pundits ignore him til the Democrats stop squabbling and settle on Clinton; perhaps even longer, to see how he performs in a head to head debate with her.
I remain very calm that there is no way he will become President.