Any sort of idea of evolution that involves linearity or degree (devolution, etc.) is a non-concept completely without merit. People are confused enough as it is to what natural selection entails.
Anyway, getting back on topic, if Turkey wants to revise the hadith, they're not going to get away with it. The hadith pertains more to history than law, and Turkey's had a long history of smothering cultural identities as it has moved towards modernization, such that they're under constant watch. It comes down to how much trouble they want to make for themselves. The Sharia is subject to local custom, so they've got more leeway with that.