Why? Don't you believe that ideologies can evolve?
Did Nazi ideology also evolve? Islam will never evolve because Muslims consider the Quran to be the perfect word of God and Muhammad to be the most impeccable man in the world. For them to evolve, they would have to admit that the religion is not 100% perfect thus nullifying the claim that the Quran is the perfect and final word of Allah. No true believer of Allah would dear to even consider the chances of the religion of Allah to be flawed.
(Quran 5:3) "This day I have perfected for you your religion and completed My favor upon you and have approved for you Islam as religion."For Islam to evolve, this verse would have to be rendered false.