The ACME Act would also make pool operators outlaws, in the same way someone operating a US Dollar printing press would be (other than the Fed).
Would the Pool Operators need to reveal their identities when issuing the self-signed SSL certs? How could Pool Operators remain hidden?
The ACME Act is only in the US, the US is not the centre of the universe. There are 6.5 billion other people on this rock, some 92% of the population who are not US. So the US outlaws US Pool Operators and miners but the rest of the planet will continue.
The Pool Operator doesn't need to reveal their identity, they just generate a self-signed cert for an IP address or URL, you as a miner add their public certificate to your certificate store and now your browser trusts them and can setup and SSL channel. To break it you will need to crack either their or your own private key. Alternately and even better would be the use of a Bitcoin address as part of the miner code that communicates with the pool as Bitcoin which already has an equivalent public and private addresses built in which are essentially the same as public and private certificates or keys, technically it would be very easy to do.