"This is only the beginning."
Yup. This whole monitoring user flow is BS since they already do - there are probably more cameras in a tube station that in your average TV studio and they've had years to figure out how crowding occurs and frankly on a transport system its not hard to figure out why if there are delayed trains or mulitple trains arrive at the same time. It really isn't rocket science.
I'd be rather surprised it this DIDN'T turn out to be a way to monitor potential criminals/terrorists/fare dodgers etc as they move through the system. At least until facial recognision technology is advanced enough that it can be done via the CCTV.