The only hope is that the zone is going to have to be moved when work starts on the station. I am assuming this would happen this winter but there hasn't been any hints yet from the airport how passengers will cross the two lane approach road. I would assume any structure would need planning permission. One thing is for certain and that is the existing footbridge and it's two out of order lifts to the short term does not have the capacity required.
If the airport can not sort out once and for all congestion within the central area then the airports capacity will never reach 18 million passengers. It would also not surprise me if easyJet did not start to look at its commitment to expand services out of Luton as at the moment all of the senior management at easyJet are now getting caught up in traffic congestion as they also have to follow the one way system to leave the airport.