I beg to differ. US was the first major country to ban travel from China. Other countries only followed suit after. South Korea, Japan, France, Germany and Italy never did, and see where they are now.
It did not matter, because patient-0 in Europe was a German. It’s now accepted that the virus arrived by crossing the Alps in some sort of Euro-business trip, not directly from China.
Unless you can read minds, these things happen very quickly now that the world is a global village.
It's going down in the US too! We're merely a few days behind. If we had no cases, or a few contained clusters, then this would be an arguably useful policy. We have multiple uncontained outbreaks already, and have yet to enact meaningful policies to contain them.
It's too late. All this ban does is try to shift blame.