There is already a single Loki miner contributing a whopping 17MH to the Loki network!! That hashrate is equivalent to 11K Ryzen 3900X units and that is only from a single miner. Once XMR forks, where do you think he will be diverting his hashrate to. And how many more of these giants lurking around waiting for the xmr fork. So, I'd say good luck trying to make a good profit from CPU mining.
Do your math, it's only 1400 Ryzen 3900X, not 11K, but I think in reality it's more like 10,000 old Xeon or Opteron farm. I don't think there are more than 10-20 such giant farms out there. Loki network is much bigger than 17 MH, and there's only 1 such farm mining it.