No, the US is screwed over. From what I've read, many areas in the US are completely reliant on imports because of how the current logistics and production/processing chain/infrastructure is setup. And the market disruption caused by an export ban would wreak complete havoc in those regions and cause significant price spikes starting from diesel and then rippling out to anything reliant on it.

This is why he hasn't done it yet. Everybody in the US with money at stake called him and told him it was a stupid idea.