Thailand will reopen for business but, when will depend on the number of cases here and in the countries where the tourists come from.. The fact that Thailand shut down and basically kept the infection and death rate low is a good thing.. Not economically in the short term but, would it of better to just ignore the pandemic like the uk or USA for example..look at their numbers.
Things a very fluid at the moment.. Thailand needs the tourist dollar so to speak.. The economy will determine what is going to happen re visas.. There will be "tweeks" happening along the way.