I can't provide statistics, but from a very personal perspective, the TSA has made me decide to avoid the US and US carriers whenever possible. I no longer connect through the US when going to Canada or Japan, for example, and only go there when business takes me, not for vacations. Many people in my circles feel the same way. In fact, we have become more and more interested in vacations and conferences in Europe and Asia.

For the visitor, the TSA is one of the first things you experience in the US, and the last. Makes a big mark.