Only reason for dialing the ball back is so the classic Tour Courses can be used again without buying up more real estate, which was one of Jack's points.
Other than that, I see no reason going forward.
His thoughts on slow play are off base.
Yes today's courses are longer, but the majority (my guess) of amateurs that play don't walk so the length is moot.
The actual playing is f-ing slow and TV/PGA Tour is partially responsible for that.
He should focus his attention on the head of the snake and maybe the rest will fall in line.
As an aside, I don't think he's right physically.
Just a Spuzzervation.