That's is so bogus, I. Was born in Russia, I was born I caucas russia, the muslim part of it, and I can tell you one thing for sure, its never going to happen, I have no idea where they get those stats. Russians have mixed with jews and tatars so much that major cities and there is only few of them were always pro russian, and forget about the rest of the country, if you are a muslim or a jew its not always save to travel to most other cities, they hate you there and they will tell it in the face.
What concerns big cities like Moscow it has all the nationalities but half of the muslims there are not muslims, they are jews from caucus, they just have similiar names. Just like jews here in America have american names.