But they in turn greatly degraded the flow of traffic by forcing the use of a proprietary always-online app which fails to load when your cellular connection is less-than-ideal. Verifying a photo ID would probably be faster.
They will instead ask "well why isn't the connection good at the concert? What can we do to fix that?" (ie. "we don't have to change when we can make you change")
It IS true that if you don't have to verify the ID of the ticket holder then admissions will go much faster. So long as they can make that plausible sales pitch, they can use it as justification for whatever byzantine DRM system they can dream up.