Rather than close it, there are plans to re-site the station closer to the actual airport,making it usable for airport users. There is an article in 'Todays Railways' regarding the area and the line.
Plans? Yes. Will they happen? No. Would it be a waste of money if it did? Yes.
There are far far far bigger problems to tackle with the railways in this region than spending money to keep this airport station open when the vast majority of people will still drive to the station. Especially when you consider that the likelihood is that the airport itself will likely close to passengers in the not to distant future.