I think TU114 has covered it pretty well as to why your idea is not practical, at best. As for retail within airports, why do some aviation enthusiasts think that shops are a waste of time and that nobody uses them? The shopping experience, contrary to what many here think, is crucial when people form an impression of the airport. Many Leisure travellers, who make up the majority of passengers from UK airports, actually want retail in their airport experience. On a more anecdotal level meanwhile, shops at many of the airports I use appear to be busy and the fact they're there suggests the business must be viable. There is an argument high end retail isn't always necessary but in my opinion they do no harm to the airport experience.
At the end of the day not everyone likes to sit at a big glass window watching a 767 being turned around, how ever much we might enjoy that.