I don't know what you mean by "mining volume", but if you mean hashrate you're incorrect.  They had between about 80-90% hashrate for the couple of months that miners were signalling for it.

This is not the only indicator of consensus, and it's likely that miners would switch to whichever chain was most profitable a little while after the fork, but they certainly did have that support.

---

With forks, I've personally taken the stance of just ignoring them.  I'm holding both chains and watching how it turns out if there are any more contentious forks going on.  Best not to make a judgement when it can change so easily.