Newsie's day dream, a "brokered convention"

The TV newsies keep talking about one.  They would just die to cover a "brokered convention".   The good old fashioned smoke filled room where party bosses cut a deal to select the nominee.  Dream on newsies. 
   In real life, the voters expect the party nominee to be chosen in primary elections.  If this doesn't happen, the voters will think something illegal, or immoral, or merely fattening, has happened behind closed doors.  They will refuse to support for any nominee selected by anything except a majority of the primary elections.   If necessary they will vote for a third party candidate who has some legitimacy.  Which will hand the general election to Hilliary. 
   Does the establishment or the voters understand this?   Given the horrible state of American schools, they may not.