It might be the only possible way to derail the Trump Express. But I think the Republican Party would be more likely to win in November with Trump, because Cruz isn't especially popular in swing states.
Here is the way one analyst sees it. http://theweek.com/articles/609746/gop-crowns-ted-cruz-antitrump-electoral-peril
Here is the way one analyst sees it. http://theweek.com/articles/609746/gop-crowns-ted-cruz-antitrump-electoral-peril