I thought AO knives were the coolest thing in the world years ago when I started buying Kershaws. I just don't like them any more. The novelty has worn off.
I see bearing pivots as the future for most high quality knives. They are very inexpensive (around $6 for a set retail so much less for a manufacturer) that leaves milling. I can't see any good reason why a manufacturer wouldn't incorporate them into their new designs. It's a selling point, again, they don't cost much (as evidenced by overseas designs from companies like CRKT) and they just plain work.