I think what's next is that all those wealthy people that Thailand was hoping to attract will be saying "No Thanks" and take their money and custom elsewhere, and the Government will be trying to find a way to squeeze more money out of the people that are here already. Ring any bells?
Having spoken to a few of my "bar stool lawyers", quite a few of them have said that they pay UK tax on their pensions already, which is almost the lowest in Europe anyway. They also have their pensions "frozen" by the British Government,(no annual increments) because they live in Thailand, so you can imagine the plans that are being made and talked about should the Thai government try to tax them on money that they have already been taxed on anyway!!! And don't expect them to be hopping in and out of the country every 6 months - many of them are too old to "hop" anywhere!
So, Thailand will lose out on all the revenue that the wealthy people/businessmen would have been bringing in to the country, and also losing the income generated by the ex pat community - many of whom kept the small family businesses of this country going when Covid was rampant.
And then the "blame game" will start!