Again, I would have to add that I personally feel the suggested barriers are more than suitable, and slowing the flow down, both on the steps and onto the pavement has to be a positive thing.
Im sure the downside is when the cabs all start parking on the pavement right outside the barriers!
Closing off that side of the station would be shocking I would think. Of course the earlier mentioned access via the car park would be a brilliant idea, and im sure one that would benefit all.