Frankly, I think that to forecast a brokered convention before the first primary is held is rather wild speculation.
But the press loves a show.

Republicans discussed possibility of brokered convention

Washington (CNN)Top Republican Party officials have discussed the possibility of a brokered convention, sources told CNN Thursday, a new recognition that the GOP nominating contest could be protracted well into the summer.

At a monthly dinner meeting this week, Republican Party brass decided it would be prudent to plan for a contested convention, which would be triggered if no candidate has enough delegates to win the nomination.

Five sources insisted that while the topic came up during the dinner, it did not dominate the discussion.

Republican strategists have long theorized about the possibility of the brokered convention, which hasn't happened in decades, but the dinner meeting appears to be the first active planning taken by the GOP to prepare for it.

The plans, first reported by The Washington Post, come as 14 Republicans plan to duke it out in the Iowa caucuses, a historically large field that has winnowed slowly. Republicans are worried that -- given that many delegates are awarded proportionally -- there is a possibility that a brokered convention could happen.

A brokered convention occurs when no candidate gets enough of the delegates to secure the nomination on the first vote tally. After that, delegates can be given up to other candidates, shifting the balance.

http://www.cnn.com/2015/12/10/politics/rnc-brokered-convention-preparation/index.html