Not that I want to see a brokered convention but I disagree with your assertion. Those candidates running in the primaries had their chance to make a compelling case for their candidacy. Falling short of 1,237 delegates suggests that they failed. The primary system might be sending a different message than normal but a message nonetheless. If no one candidate can rally sufficient support to garner the necessary delegates, perhaps, it is time for a do-over at the convention.
So it makes more sense to pick someone who couldn't even generate the support to make a run or someone who got even less votes and dropped out or finished behind Cruz and Trump? Sorry I can't follow that logic. If you are going to have a primary system then whoever gets the most votes should get the nod. This is especially true when there was a very croweded field which almost guarantees that the eventual winner would win with a plurality of votes.