The NFL really exist for one reason, to make money. If they don't make money, it cuts into the owners profit. Goodell could stop this, but doestn't have the nads to do it. To get their attention, go after the revenue stream.
The largest revenue stream is likely through the media outlets. If we can boycott the advertisers, the media will put pressure on the NFL. Let the advertisers know you will not be buying their products. Can you imagine if the networks can't sell comerical spots during a game. How about super bowl spots. That would bring some action.