Great discussion in this thread.
I think whether you trace the park's demise to the desire for CP to remain the jewel in the crown or to the Paramount Parks acquisition, it still comes down to Kinzel's ego.
It was his way or the highway, and he thought he (and his team) could do a better job at running all of these parks than the competition. That's why CF pompously refused to maintain the animals in Aurora, which were a huge draw and what made the park unique. It's where their slogan for Geagua Lake, "The fun is back," came from, even though history has proven that to be wrongheaded.
I will say that there were a lot of good things about Kinzel's era from a guest perspective -- amazing additions at CP, and even more amazing operational efficiency. But it was time for him to move on. Today, labor at CF parks is treated better (not that some of his legacy doesn't live on...) and capex is more thoughtful and modern across the chain.
I agree with the sentiment that SFWoA, for its short life, was something immensely special. They even got the operations to far surpass usual Six Flags standards once they combined the parks. For a well-rounded experience, it easily surpassed CP, GAdv, or any other regional park while it existed, and whatever you trace it back to, the fate of the park is pretty devastating.