Bars are not the only tourist revenue earners for Thailand. ie Bars are not the metric for tourism earnings, except for bar stool tourists.
Few of the falangs leaving would also help reduce crime here.
Most of the developing world were colonies of western world, but some falangs may have missed independence of these countries and cant digest progress of non-western countries.
This is real people. let it sink in. Chinese and Indians are wealthy and come in numbers, whether others like it or not. Russians have cash and they will spend where they feel like.