And the/a flip side is...
Turn the question around.
If you are the admin of a network covering an area that covers copyright material (say a gallery or the like) or in which people have an expectation of privacy (say a gym which has a change room in it) which may be legally enforceable can you afford *not* to make the effort - whether it is ultimately effective or not - to block a glasshole's network access?
What happens if pictures of copyright material end up on the Internet or some creep streams a little video from a change room and then someone sees it and throws a sue ball at you (and the glasshole one would hope)? Ask a lawyer, but I'm thinking that a glasshole block in place would probably make it much easier to dodge the sue ball (and maybe lob one at the glass hole).
I'm afraid I'm firmly of the opinion that when Google decided to put a camera in the Glass they were doing evil; by not recalling all Glasses and physically removing the camera they continue to do evil. I say to Google: Don't be evil.