Brent,
Despite wishing to close on this thread personally, I can't let certain comments go unaddressed when so many don't know the reality. Stating that the double-bag scenario is the foundation of caddie golf today is inaccurate. Most every facility offering caddies in the U.K has single caddies offering the service in the main. It is rare to see a double caddie on a Scottish golf course from my experience.
Many stateside clubs also have a heavy, single caddie-based model. Most Evans caddie programs, and many others, favor singles. The career caddie folks generally double. It's economics. That said, many older caddies love the single bag, and class caddie clubs AND their caddies often adopt the singles mantra during the slower shoulder seasons to keep everybody working. Again common sense guides them, not some uptight concerns about what the caddie might NOT be doing.
Internationally, in countries such as India and Argentina, and others here on GCA with experience could speak to this as well, singles are often the main way it is done. The cart-ball Asian model, with the gals each handling a cart with two players, offers another scenario.
There are many ways caddie golf is provided. The double-bag for life assertion is just one of them. It does NOT define the entire enterprise. Not even close.
Cheers,
Kris