Frustration is why people are leaving. Good players are not leaving the game. Only those not able to improve are leaving. Better methods of play than the Traditional Swing are available. Noone will teach it. Everyone condemns it.
My opinion is those one way types are the reason for the staleness of golf.
Just look to the PGA Tour at the varied types of golf swings. There are many ways to swing a golf club. PGA Teachers in America are stuck teaching a method soon 100 years old.