Several NFL teams like the Steelers already don't have cheerleaders. You could get rid of them all and I wouldn't care. I also have to say that going to a football game is one of my favorite things, I try to go to at least one a year. I find the sport tremendously exciting.
If you don't like football that's your business, but to say that there would be a problem without cheerleaders is pretty ridiculous. The NFL is unarguably the most popular sport in America and at least for my hometown team (Go Eagles!) the entire season's tickets sell out in minutes after they go on sale. I don't think people are doing it for the cheerleaders, and I'm guessing the team will get by without whatever percentage of people were going for that reason. Maybe it would take 16 minutes to sell out instead of 15.