There will not be any general reformation. We can only hope that the Salafists/Wahabbis run out of money, and their brand of Islam is replaced by some other brand among the Muslims.
BTW here is an important article: Why Join ISIS? How Fighters Respond When You Ask Them A study finds that motivations vary widely.
http://www.theatlantic.com/international/archive/2015/12/why-people-join-isis/419685/
Thanks AdmSmith.