You wont be thinking of it the same way when the hash power slowly starts to transfer to the Bitcoin Cash chain. Its more of a threat than a spam coin.
But why would it?
If we don't talk about political issues here, why would miners choose to abandon mining of the real Bitcoin in favor of Bitcoin Cash? Wouldn't that mean losing profits? Indeed, if just a few miners switch to BCH, they may in fact start earning more, but, in my opinion, it is not worth it as long as Bitcoin Cash is 10 times cheaper than the real Bitcoin. Anyway, it seems that mining pools like ViaBTC continue to mine both coins, so it doesn't look like any mining pool is going to leave Bitcoin Core mining altogether
Leaving politics aside, BCC could be worth much more than it is today. Let say the price doubles, in a few months, making some miners leave BTC and start mining BCC. Without BCC's emergency difficulty adjustment feature, it will make BTC confirmation time longer and will have to take a longer time to adjust. This will then result in the market reacting negatively.
BCC having increased price and increased mining power will make the market react positively and as long as the price increases, so do the hash power.