Whilst PoC seems to nicely complement PoW, proving capacity usually creates insane wear on the HDDs and SSDs used. Thus, a lot of waste is generated, and there is no real advantage over PoW.
Maybe this could change when using workloads that are actually useful as a side effect, e.g. for archiving, in order to prove capacity. Until then, I don't see enough advantage in putting resources into PoC schemes.
SSDs would be the ones mostly affected with PoC mining because of the way they're designed. Flash memory isn't meant to experience read/writes at a constant rate. HDDs are a much better choice. What I'm worried about is data centers' ability to centralize cryptocurrencies based on this unique mining algorithm. Unless, leading coins such as Signa and Chia come with a better approach. Developers can simply introduce a mechanism that would lower block rewards to individuals with large amounts of storage space. This would effectively bring the "little guy" back into the system.
Funny thing is that Signa and Chia are the only coins with a PoC consensus model. All of the rest are either classic PoW or PoS "shitcoins". Seems that there's no future in HDD mining at all. But I could be wrong...