Despite Dublin's age Quinn is certain he could have been successful in the Blue Square Premier.
"He's playing at Championship level and he would play at this level, no trouble at all," said Quinn.
"I was 38 when I played at Peterborough and I was leading scorer, player of the year and in the PFA team.
"I tried to convince him to give it another year, come to Cambridge, but he wasn't having it."
Dublin scored 52 league goals for the U's but Quinn has given up in his bid to add Dublin to his squad.
Quinn said: "He's totally made his mind up to go and do the media work in television, he speaks very well so he'll take to it like a duck to water."