Exactly. So unless everybody in the world who has an orchid tests every plant, and destroys any that test positive we really will just have to live with it.
Demanding that the growers "guarantee" they are selling virus-free plants will destroy the whole booming industry, and make orchids prohibitively expensive for hobbyists. It still would do no good because as soon as someone like me brings a clean plant into my collection, it will eventually get infected anyway. Thrips being thrips . . you know.
Viruses cross from one type of plant to another as well. So even if (in a perfect world) we eliminated viruses from orchids, new ones would show up and infect from . . tomatoes or impatiens or something else.
It's purely a case of "letting Nature take its course" and waiting for the plants to develop immunity .. or die off. In 10 years, there may be no Cattleyas at all for sale because they didn't get immune fast enough or not enough crosses are at sale-able size yet from the resistant varieties. Then they'll cost an outrageous amount for a while until a sufficient number are grown to supply the demand and drive the price down again. A very sad thought.