Upon this very long argued vision of Thailand.
I'm from Newcastle and flew their via Dubai 3x within the last 5 years. On every one of those flights coming back, there was another person from the North East of England.
It would, however, make more sense that tour operators looked into places such as Phuket and Koh Samui.
I think Hua Hin would be viable but after Phuket and Koh Samui are set up.
Chiang Mai and Pattaya are high in tourist numbers but I don't think would be viable for tourism. Especially as Chiang Mai airport's airport is small and Pattaya isn't close to an airport itself.