Trump has had a golden opportunity in the last 4 weeks to appear more presidential and attempt to unite the party and he refuses to do so. My entire extended family is horrified of Trump and all but one claim they will never vote for him in November - they all love Cruz. On the other hand, if Cruz steals the nomination (playing by the rules established years ago), the nomination won't be worth having because most Trump supporters will sit out or worse vote for Hillary.
So the solution, is for Trump to start showing his strength, getting 50% or close to it in the remaining primaries, show an attempt to understand policy and actually speak to the issues in a way that conveys a decent level of cogency and not tweet about Megyn or Heidi.
These things are in Trump's control. If he can do these things, a lot of concern will fall away, and he can reassure those who are presently horrified about his candidacy. It will take discipline. Does Trump have any?
I agree with you about his penchant for drama and bombastic outbursts. Its often unbecoming of him and certainly not presidential. Even his wife recognizes this! lol
Trump is new to the political process, and it often shows. At 69/70 can he make the transition from his business world persona and nonpareil street brawler into a more disciplined statesmanlike character? You have hit on what is perhaps the defining issue for him in his campaign for president.
Trump has given voice to very important issues which many people, who are seriously angry about the direction this country is going in, care deeply about. For that we owe him a debt of gratitude. I also think he may be the only person who can effectively deal with the unchecked invasion of immigrants into our country that is becoming an existential threat to our nation as we know it.
Cruz had a big, and well deserved win last night, no question about it. Ironically this might be the “cold shot” Trump needs to convince him to up his game and to (as you so aptly put it) “actually speak to the issues in a way that conveys a decent level of cogency”. That could be his key to winning.