I don't know how you concluded that the EU was the reason for eXch's shutdown 
, but the US is still pursuing mixers on money laundering charges. The only difference is that they have stopped attacking end users.
I guess theymos might still give it a second go even if mixers are still being shutdown by agencies if it's proven that those agencies won't go after people putting a mere small banner below their posts about the service, just like they won't got for legitimate users that want privacy and are not hacking exchanges and phishing people., but the US is still pursuing mixers on money laundering charges. The only difference is that they have stopped attacking end users.