Unless he is a super athlete and possibly ambidextrous I would advise against it. Looking back I would have probably forced my son to hit left handed early on, but who knows? Maybe he wouldn't have turned into a college-level hitter from that side. I also discussed with a really great hitting guru having my son start to switch hit at the age of 11. He said no - unless, again, he is extremely gifted, he will always have a weaker side so work on the better side of the plate. Bottom line, dad, I think you should work with what your son has and not start from scratch this late in the game.