Well when I mentioned the larger markets I only meant in the NBA. The NFL has long shattered the idea that only large markets work well. Also, the Nets are in a fairly large market, obviously not NY or LA but much bigger than a lot of other markets.
However, I actually agree with you on a lot of your post. I've always felt that teams like the Lakers are ran VERY well. I'm a big believer that you make your own luck, and the Lakers have definitely done that over the past 30 years or so. They get the very best when it comes to their FO, as well as their coaching staff. When you add those factors to the fact that they also are VERY aggressive, they easily make their own success.
With that said, it makes it a lot easier to do these things when 1. your television market helps the money flowing in, and 2. your owner is willing to go well over the luxury tax threshold and will spend inordinate amounts of cash in order to keep your team in championship contention. These are the only true advantage I see a bigger market team has over a smaller market team.