When and if that happens, look out, because there are hordes of Christians In Name Only as well as Jews without Judaism who will flock to the new faith along with the mass of spiritualism freaks who have no religion other than themselves. If I'm right, it's decades away, but it fits nicely with some other prognostications that are far better known than mine. Particularly since Sufis could work hand in hand with Turkey to recreate a new Turkish dominated Ottoman Empire encompassing everything from the Middle East to China given the Muslim nature of the 'stans' that were formerly part of the Soviet Union.
I agree. I know flakes of Christian and Jewish background who are into sufism and I think you’ll find an increasing number of movie stars and other celebrity idiots taking it up. To them, it’s Unitarianism with finger cymbals (although orthodox sufis aren’t really any much different from other Muslims - but the celebrities’ mental image of sufism is based on the charmingly ethnic whirling dervish branches).
However, I don’t think they will be able to drop the rest of Islam, and in fact, I don’t think they really want to. Actually, if these modern Sufis posed any threat to main-line Islam, it would be attacking them...and it’s not.