I just don't buy this narrative. What primed the USA for decline was it's new allergy to manufacturing, addiction to social media, and Trump taking his spot as POTUS twice. If anything, these wars were something for everyone to worry about, which involved actual critical thinking. They were nowhere near the root cause.
Social media addiction didn't come around until about 2008 - and even then it took a few years to become widespread. Trump being elected twice isn't the cause of the decline, it's a symptom of it. The GWOT is one cause among many, but probably the one that pushed things over the edge. It led to both Iraq and Afghanistan wars which cost $Trillions that we borrowed and still haven't paid off. Not to mention the lost lives on all sides and further destabilization of the ME. Our over-reaction to 9/11 was the terrorists' dream. It's hard to imagine an outcome that would've been better from their perspective if their aim was to weaken and destabilize the US.