I will think further on this, but my initial reaction is skeptical.
There have been no reports of huge uprisings of anger against ISIS in the Muslim world.
Here in the USA, we purportedly enjoy a vast breadth of freedom to speak our minds. One would think that the outrage on the “Arab street” against ISIS would be heard here.
I’ve seen silence.
JMHO.
The muslim world is waiting to see if ISIS has what it takes to win a victory against the west. Then they will flock to ISIS.
I would not assume that Islam is dying until every last mosque has been shut down for at least 100 years.