Yep, that's a really good point. I believe United and Liverpool supporters already tried the walkout style protest and it did nothing. If these people give up their season tickets thousands of tourists will buy them up and those supporters might get put on a 20-year waiting list to get them back. The best tactic, like you mentioned, is to deliberately have games cancelled, week after week, point deduction after point deduction. Can't have the team bus drop the players off when there are 10,000 angry supporters blocking the entry, can't kick off if there are constant delays for security reasons (albeit, not due to serious individual attacks or anything). Force the powers that be to make their decision and if it is to further punish the fans then at least they played their hand and there is no going back, now even the dumb naïve fence-sitters can deny who the real enemy is.