Perhaps small tariffs in the short term, but: (i) I don't think people are engaging in that much trade at the moment, (ii) while it's an update, I don't think this will change most people's estimates very much.

In the medium term I don't think so, because the network is greased by deeper understanding of what others might do. I think your patch is a step in that direction, and may increase acausal trade by accelerating full understanding. It could decrease it in the medium term, though.

In the longer term, I guess everyone figures everything out, and this has no effect.