Isner v Mahut - should there have been a tiebreak?

Question

John Isner took until 70-68 in the fifth set of his first round match against Nicolas Mahut at Wimbledon to finally secure victory. But though the match was one for the record books, does it provide compelling evidence for the introduction of a fifth set tiebreak at the Grand Slams? Find out more at http://blogs.bettor.com/Isner-vs-Mahut-epic-to-tiebreak-or-not-to-tiebreak-a13649