Lots of existing ivory becomes illegal, leading to a local drop in value, leading to lots of US ivory being traded to countries where it isn't illegal. Right?
So that first of all that sets up excellent opportunities for police sting operations. But it also drives down prices (at least for a few years), making elephant poaching less lucrative.
In parallel to that, the US is setting an example. A lot of countries copy US criminal laws rather than thinking them up from scratch (the War on Drugs being the textbook example), and since almost everyone loves elephants and the ivory trade is a huge and growing threat to them, there'll be a particularly low threshold to copying this one.
Lots of existing ivory becomes illegal, leading to a local drop in value, leading to lots of US ivory being traded to countries where it isn't illegal. Right?
Sigh. Wrong. Why don't you at least look at the original link to the article about the ban? Notably, it says (emphasis mine):
Last month, the White House announced a ban on the commercial trade of elephant ivory, placing a total embargo on the new import of items containing elephant ivory, prohibiting its export except in the case of bona fide antiques, and clarified that “antiques” only refers to items more than 100 years old when it comes to ivory.
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