Glad you have a sense of humour as well - it didn't come out in your previous reply to me
I totally take on board what having a single airport could offer in terms of international links etc .... but I still maintain that the actual buggery of just GETTING there would prove extremely difficult to a significant proportion of the passengers - we are "blessed" with a crappy little transport corridor up here ... I mean who the hell needs a satnav in dear old Ecosse? There's only ever one route anywhere and it's busted at the seams virtually constantly
Anyway, tis the joy of Internet arguments ... plus the investment you're talking about seems, sadly, fanciful in this day and age - we can barely get property developers to spend a penny outside of Edinburgh (unlike with Manchester for example, where cash pours into the area), never mind spend the amount of infrastructure that would be required....
Take it easy
