This article then extrapolates an 80% drop in 7 banned countries into an 80% drop on the entire sector to reach a conclusion of "billions of dollars" and "hundreds of thousands of workers".
Or in other words this is one of those legendary "fake news" articles.
At least it included the agent of its own debunking within it.
International tourism to the US is worth about $220 billion a year, with strong year-over-year growth every year since the recession ended.
A 6.8% drop does indeed translate to billions of dollars, which can indeed be assumed to translate into hundreds of thousands of workers.
No, a 6.8% drop over the course of a few weeks is not "just random". Statisticians know how to control for things like seasonality and can normally predict expected numbers very precisely, barring some external factor -- like the President of the United States sending a clear message that foreigners are not welcome.
How can you possibly say that? A sudden 7% drop in any industry is indeed devastating.
Hmm...seems like you need a refresher on what that word means.
I think it is too soon to say if the tourism drops is permanent or just temporary.