Apparently, the ChainX community has spoken: only X-BTC will now mine PCX through the asset management dapp. I find this to be not a little disappointing, as most of my mining was being accomplished by SDOT. Not only is SDOT no longer used for mining PCX, it is also no longer supported by the dapp's exchange and cannot be transferred out, making any SDOT held by ChainX users a total loss at this point. Mining profits made prior to the decision to discontinue L-BTC and SDOT cannot be claimed, either.
Despite this strange and apparently damaging decision, PCX still appears to be holding at about $6. I cannot speak for the rest of the ChainX community, but for now, I will earn PCX exclusively through voting freeze. This seems the safest way to get consistent, if relatively small, gains of PCX for the time being. It is my hope that, as the cross-chain platform grows and develops, more mining options will become available.