If the barrier people really think 50 people can get through a minute, would they be willing to have training days to show old folks and out-of-towners that they don't have to wait for the gates to shut back up before going through or genarally how they work.
My dad isn't a technophobe, and has used Oyster once or twice before, but last time he was under the impression that he could hover his card above the reader to get through rather than touch it. He was about to go and tell someone his card was broken until I told him he was doing it wrong