It will be interesting to see how Joe Public react to any changes. I guess most only come to Luton once a year and as they know where they are going will not look at any signage so will attempt to get into the existing drop off area, which will be controlled by some sort of card entry system.
The last time the airport authority tried to direct drop off traffic away from the terminal they installed railings all the way around the roundabout but that did not stop Mr and Mrs Passenger using the roundabout instead.