Intriguing. It's a bit "turtleish", but an amusing observation nonetheless. Does he deal with the possibility of that scenario looping? (That is, universe A creates B, which creates C, which creates A again.)

Most of my thinking along these lines has been to specifically come up with a metaphysics that is *not* subject to the "turtles all the way down" problem. It's difficult -- the one I've been leaning towards gets downright mystical, and just a smidgeon unsettling...