We're not talking about courses with 6 sets of tees.
We're talking about a plate in the ground that designates a playing environment appropriate for junior players.
Yes, you can always just go and pick a spot to drop a ball, whether at the 150 pole, the start of the fairway or where Dad's drive ends up. But there's also value in designating such a place on each hole with a "family tee" marker. Like Mr. Grieve, I don't need a critical examination of the societal impact of this move or the espousal of various theories of golf training to tell me this is the case.
I'm surprised Mr. Mucci didn't notice them while he was recently playing Sleepy Hollow. Or the last time he played Whipporwill, Fishers Island, St. Andrews, Piping Rock, The Creek Club, Wykagl, Pelham, Brae Burn, Westchester, Plainfield, Baltusrol, Essex County or any of the other courses that have adopted this model as listed here (you can change the state using the pulldown menu):
http://www.playgolfamerica.com/index.cfm?action=family_course&state=NY#Search around a bit, I'd bet you're going to be surprised at the number of courses that are already using family tees.
My guess is that courses like Pine Valley, NGLA and Seminole do not have the same focus on junior/family golf as the clubs noted in the link. There's nothing wrong with that, that's just the nature of those types of clubs. There are places where they are appropriate, there are places where they won't work. That doesn't mean that in the right spot they don't make sense. And despite the best intentions of the Last Ten thread to prove otherwise, most of the world doesn't play their golf at iconic golf courses.
Instead of insinuating that golf has been just fine without these types of measures, perhaps you should be asking if golf would have been even better off if these types of programs had been instituted earlier.