I like the song The Rocky Road To Dublin but do these producers/panel really think that The Rocky Road to Dublin is more popular in Ireland than either The Fields of Athenry or The Wild Rover, neither of which seem to be included in the list.
I would contend that you'd be far more likely to hear The Fields of Athenry or The Wild Rover being sung by an average Joe than The Rocky Road To Dublin.
Maybe the panel thought those two songs were too 'common'?