You show that there is talk of it, talk of proposals.
I'm sure there is a minority of (big money) tax refugees residing in Thailand who don't pay taxes in their home country. As well as those Thais working overseas and bringing money home to Thailand.
For the rest of us poor schmucks residing in Thailand, do you really think Thailand has the resources to track us? Immigration has enough trouble making sense of my bank records for my extension. How on earth would they figure out my tax return from home country? I would think before the tax man tracks down foreigners they will start with the millions of Thais who don't file.