Tourism is increasing because billions of people have been lifted out of poverty, especially Chinese, and now they want to experience what those in the West have experienced for decades with their disposable income. Now that the formerly poor have the money to travel, I expect more people complaining about the tourists, e.g. a big bus of Chinese pulls up in a small town, some kid vandalizes something or some people leave trash, and a stereotype that "these people" trash the town emerges.
(I'd also say Americans don't travel enough, less than 1/3rd have traveled abroad, and some of this ignorance bolsters American exceptionalism, because until you see how bad shape your infrastructure is in, or how good healthcare, health, and public safety is in other countries, you have no context to be skeptical of some of the crazy political assertions thrown around)