Personally I think that these conversations are focused on the wrong thing. Facial recognition stands to be a great tool in spotting "the bad guys" so that appropriate measures can be taken. For example preventing people who have repeatedly been convicted of violence ("hooliganism") from entering sports stadiums. The problem that is not being missed in the conversation about the technology is: who gets to decide who…
No. Processing biometric data like facial features must require person's consent. Individual's rights are more important than interests of capitalists. If someone is a hooligan they should be put in jail not denied entry.
For publicly-funded venues, you may have a point. But if Bimbo's or the Warfield in San Francisco wants to ban someone and it's not for a reason prohibited by law, more power to them. Casinos have been doing this for many years, and generally speaking businesses have the right to refuse business to anyone. Make them post signs if that makes you feel better, but they should be able to ban, say, a person who attacked a patron or staff at the venue (and then was swiftly let out of jail by an activist judge).