i don't think the government can ever regulate mixers! by definition a mixer must remain unregulated. so all they could do is either shut them down and the mixers will either shut down or move away to somewhere that those governments can not touch them anymore.
and all this drama will only make things more decentralized. for example if they start shutting down mixers then things such as Coinjoin will become more popular, Anon coins like Monero would fly to the moon,...