Essentially all societies (Europe, Japan, Canada, Korea, etc.) that have built a rigid social safety net (healthcare, education, elderly care, etc.) tax fixed assets as it's impossible to move and low administration to tax. Also, since it's an actual piece of the land in the aforementioned country it also makes sense on a philosophical level.
To continue not taxing fixed assets, and to continue only taxing 4 out of 37 million working people - just to make it all up by the very burdensome route of taxing foreigners international transfers just doesn't make any sense to me. That's why I believe either this will be a "nothingburger" (i.e. self reporting with very few controls) or an absolute smash to Thailand as an expat destination.
Rest assured, not a single Russian, Chinese or Indian (their 3 top tourists) will self report any tax on international transfers this coming spring. Not one.