You really have to wonder how ad companies are going to survive on the net as user-friendly things like chrome/firefox extensions continue to gain in popularity.
I wonder if at some point router manufacturers may include an ad-block feature for the general public that is too stupid to find these other methods.
I'm currently running an Asus router with tomato firmware that has a built in Adblock. The blacklist gets updated daily and does a great job at blocking YouTube ads especially on IOS devices.