If Thailand removes their various taxes on imports that's all they can do and then it's up to the market. I would totally disagree with Trump putting tariffs on Thailand simply because there is a trade deficit. I agree this is probably the first step in a greater bargain they can do down the road.
The worst thing to do is what we have been doing, which nothing and just sitting there and taking all this one sided trade with countries that have interest in being fair at all.