At the very least you should inform potential customers that they require the correct paperwork in order to work in the countries specified.
http://blog.therealcostarica.com/2009/08/13/the-new-costa-ri...
It's more likely that Thailand will continue to tighten the tourist visa rules in order to prevent people staying more than a few months.
People should remember that Thailand is protectionist, xenophobic and cares very little of it's foreign population.