The best way to secure the option of keeping the AGLCS is to use the "green" word. I agree that it is a fantastic system that enhances safety at busy complex airports.
With todays apparent need by many managers to be seen to be doing what is fashionable rather than what is prudent, just mention that they will be saving the world from extintion because the AGLCS only uses the lights it needs. Must save X tonnes of CO2 a year. Never mind the other X tonnes of fuel saved and emissions not produced because of the more expeditious taxiing times thanks to the system.
Perhaps we should be told who is the person responsible and his or her job title, that wants to raise the issue with BAA.