I have been against best of five sets because I believe that it moves the games out of the realm of expertise to that of physical fitness. This seems to be another marketing strategy intending to organize more matches and make more money in the same time. Nowadays tennis players can afford to temporarily slow down at some points of the game and later kick back with furious anger, thus introducing color and excitement into the battlefield. This change would turn the tennis game into some kind of 100m sprint. And this way, tennis won't be tennis anymore.
Tennis is a sport but it also is entertainment.
I think this would also help out singles matches at the grand slams. All players would benefit. It would shorten their playing time and less playing time means fewer injuries. How could this in anyway be detrimental to the game is beyond me. I think it's a great idea.