The author got this story completely wrong, and I don't need as much space to get it right as he did to get it wrong.
The correct reason we can't have a Wonder Woman movie is simple: no one can hold a candle to Lynda Carter. She was the epitome of Wonder Woman. Anyone else would be a mere shadow.
Who would look as good as Lynda Carter, but be humble enough not to show that she looked that good? Who is athletic enough to play the role? Who has the perfect mix of toughness and humanity and compassion to pull off that role as well as Lynda Carter? Answer: no one.