Nobody here knows exactly how this all is going to shake out. Except if you're not a tax resident -- in which case nothing will happen.
A lot will also depend on your specific financial details and your nationality.
My prediction take it or leave it based on what we know now is that tax resident expats will be burdened to file in Thailand and prove to them you have no tax liability here, or if you do, to file and pay it.
We shall see.