Maybe, by web wallets from which the transaction is coming? I guess a lot of bitcoiners are using the Coinbase web wallet (I use it too, for the record) which is the US company, so the Chinese miners may just start rejecting all transactions that are coming from this wallet. I also suspect that a few other notable web wallets (Xapo anyone?) are primarily the US companies as well...

There may also be American exchanges and mixers which could be heavily hit by this