I think everyone is a little bit different. I think it really depends on how bad your digestion is. If you are getting great results with a probiotic and your gut has healed nicely then you could probably slowly ween yourself off it. There are also a lot of great natural probiotics you could make if you want alternatives to the pill form.
"If man made it, don't eat it" - Jack Lallane
People say I am on a "crazy" diet. What is so crazy about eating veggies, fruits, seafood and organ meats? Just because I don't eat whole wheat and processed food doesn't make my diet "crazy". Maybe everyone else with a SAD are the "crazy" ones for putting that junk in their system.