I regret your feelings / findings of prejudice against Mormons here on FR. Since I am not LDS I must defer to your knowledge about specifics that you have found. While I do not agree with many of the tennants of your faith, to me it is the same as my Jewish, Roman Catholic and Buddhist friends, I take people as I see them and treat them as I want to be treated by them. I will say that my first exposure to LDS history came from a delightful and insightful biographical novel, "Papa Married a Mormon" that I still have in my library.
Having said this, it will probably not surprise you that I hope your predictions will come true, we need this for our future. A Mormon President is no more frightful to me than a Roman Catholic was 52 years ago or a mixed race raving liberal 4 years ago. Uh, I retract that last - he is frightful as a liberal!