In 1993, the MLB had a lockout, ending the season early and canceling the playoffs. Fans didn't like this much, and it showed in attendance. Average numbers dropped from 31,600 per game to 25,200 per game. As an outsider, I noticed the media adjusted to not having baseball to report on and other sports (most noteably football, as the season started right when the strike ended the season early) become even bigger juggernauts than they already were. It took about ten years for the MLB's attendance numbers to rise back up to the numbers they had before the strike.
It seems that when it comes to the NFL, fans are even more upset about the possible lockout. Whether fans think it is the owners' fault or the players', everyone seems to think that both groups must be stupid to let this cash cow dry up. So let's say they do. Let's say they take us, the fans, for granted, and put money first. Is this just a necessary part of business? Is it something that will upset you? What will you do?