How long before ig gathers a load of dirt and looks filthy? How long before balloons are caught up in it, or it's got a load of litter and/or balls lobbed up and caught by it? How much did it cost? How long before it (like the glorious "B of the Bang" that adorned the Commonwealth Games stadium a few years ago) starts to fall apart and becomes a safety hazard and has to be removed, leaving an obvious and embarrassing void?
For goodness sake, passengers go to an airport with the sole intention of getting out of there at the earliest opportunity, not to hang around and gaze in awe and wonderment at some lump of shaped metal hanging from the ceiling.