A brokered convention is the wet dream of journalists everywhere, especially inside the Beltway.
It almost never happens, and the last “brokered convention” candidate to win the White House was FDR in ‘32.
I’ll bet that it won’t happen.
The rules of the Republican Party almost guarantee a nominee prior to the convention. After the first several states, the remaining states are winner-take-all. Therefore, the first several states are simply to winnow the field.
There isn’t really anyone I could imagine even becoming the nominee that isn’t already a candidate in a brokered scenario.
Maybe Bob McDonnell.