The trouble with automatic pedestrian gates like what have been provided is that the emergency escape gates can be opened by hand if you are on the pedestrian crossing and the auto gates lock across the entry/exit. Once commuters found this out then they simply use it as a way to circumvent the locked auto gates and so render the whole exercise of providing auto pedestrian gates useless. You see it everyday near stations provided with these crossings. Woodville being a classic example of it at busy times!
A lot of pedestrian crossing's are not sighted in good places either and some are provided on blind rail curves as well. Some though are positioned in places were a freight train has to stand blocking the crossing and so the public decide to climb over the stationary train carriages to get where they are going or else walk around the train rear end by walking down the tracks. This last one is done at Mile End and it is just a fluke that so far no one has been killed doing it. When the new track dive is bought into operation in the parkland's at what is now called Torrens Junction hopefully this stopping of long trains over this particular pedestrian crossing will cease, however the speed of trains over the pedestrian crossing might then increase and catch unsuspecting public. You fix one thing and create another problem.
People are lazy and want to take the shortest distance between two places even if that includes risking their lives to do it, also here in South Australia public cannot wait a couple of minutes for anything, most probably the same interstate as well.
All the crossings are being closed for safety reasons but I would bet you that as soon as they are removed or barricaded off some fool will still decide to use that particular place to cross the tracks. The woman that was hit by the Overland in the Adelaide Hills the other day was reputed to have been doing this using a place where there is no pedestrian crossing instead of going a bit further and using a provided one, not that it means much as even one that is provided can still get you killed if you are not alert to things around you, telephones and Ipads come into play here especially if ear phones are used.