What to do you expect when Erdogan slaps Europe, EU, and the entire West on a regular basis?
When an organization like OIC is so moribund, what can we expect from a grand Muslim alliance? Currently, the Muslim is divided and fighting over itself with no sign of it abating anytime soon. The Sunnis fear an Iran-led Shias and vise versa. This is a laughable idea, at best. And stop blaming the US for everything that goes wrong in ME. There is more than one chef in the kitchen.
Turkey can leave NATO if it wants. It just has to make the decision to do so. So far, it hasn't. Perhaps the benefits outweigh the cost...for the moment.
Disintegration is a strong word, more like state of flux. NATO will may be replaced with a Euro-centric defense pact sans Turkey and a greatly reduced role of the US. I support and is long-time due.
Turkey is buying Russian S-400 SAM system and wants warmer relations with Russia. At this moment, Turkey is acting more like an enemy than a friend of NATO. This is not going unnoticed.