I believe many of us will remit and live on pre24 savings, perhaps combined with a small portion of post24 income, dividends , gains (low enough to keep the tax reasonable).
In a few years the pre24 savings will run out and will have to be replaced with generated post24 income.
This funds will be taxable when remitted to Thailand.
If relocating out of Thailand at that time these funds will be tax-free and will create a huge incentive to move .
This is a situation Thailand must avoid and probably there will be new regulations in place.
I guess we will see a world wide income taxation (remitted or not) in a few years with amnesty for the generated post24 income.