I agree with your thoughts on the subject. No one knows for sure how all of this will unfold, but if they started requiring all tax residents to report and pay taxes on their foreign income, then I think the vacuum it would create would be much worse than the slow down on remittances they experienced this past year.
Luckily, I did get the LTR-WP last year so I feel pretty good, but if things changed for the worse, I would simply stay in Thailand less than 180 days. I know a lot of expats won't have that option, so I really feel for them. Lets hope it never comes to that.