Kidlington is not an "Airport", it's an "Aerodrome", I can rename my house a castle but that doesn't suggest that Wills and Kate will be popping by for tea & biscuits anytime soon!
Lydd renamed itself "London/Ashford" gawd knows how many years ago and what has developed there and since? Kidlington, equally as ridiculously, renames itself "London/Oxford" and, at this moment in time, a tin pot (poor country) operator has come in with 50 seater geriatric turbo-props offering bucket shop fares that, by all accounts, are carrying load factors of some 15% and guys on here are talking about "Aerodrome" rail stations and "What routes next?".
Come on, get off your Scalextric and/or your Hornby train sets, Kidlington is a regional aerodrome that, alike Lydd, is trying to make it in to the big time, pigs will fly before that ever happens so, perhaps, time to land back on planet earth and start thinking realistically.