Newquay is a tough location - it isn't really close to anywhere and the train service from the Far West is highly competitive. If you live in Truro say you have a 30-45 minute drive, a 30-45 min checkin..... by that time you can be halfway to London
They've also improved the road significantly and London - Truro/Newquay is a fairly straight forward 4-5 hours
Really can't see it surviving