After 9/11 some of the changes made by TSA were referred to as “security theater”. They were more about making people feel safe rather than actually making them safer. While masks will help reduce the chance of a person spreading the virus in the plane it is also “safety theater”. If it makes them feel safe and gets people flying, it’s a good thing. I’d be willing to bet you will see the other airlines follow JetBlue on this. Right after they notice our loads are higher than theirs on the same route.