I don't think that the ride in itself is the issue - as JTF explains, all over the world it's the norm. Narita is still a cool one hour from most parts of Tokyo, even longer at times. HKG is 25 minutes from Central Hong Kong. Milan Malpensa is about the same. Singapore's CBD is 20-25 minutes from Changi via MRT. So in the proper context, there's no issue with riding a comfortable express train 30-40 minutes to the airport.
The issue is the massive paradigm shift that would be required to make such a system viable here. I think it's safe to say that OKC will never be as dense and transit oriented as Tokyo, Hong Kong, or Singapore - so such a system here is sadly a non-starter. Though I have to say - in-town check-in at the station is incredible. Saves an unbelievable amount of hassle when you travel with as much stuff as we do!
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