Simple miners (one algorithm miners that can't algo switch, like xmr-stak) will be on cn/2 algo mining Monero. Others like xmrig (and/or patched xmrig from https://github.com/MoneroOcean/xmrig and https://github.com/MoneroOcean/xmrig-amd) and srbminer (or simple miners with help of mm.js from https://github.com/MoneroOcean/meta-miner/) will mine full specter of supported coins/algos as usual.