To me, the posit still holds that there are many coins vying to be the coin for “medium of exchange”. Bitcoin Cash may have some technological advantage temporarily, but it’s not a moat. There is not a big defendable position for BCH. The only way Bitcoin Cash thrives longterm is if it overtakes Bitcoin Core as the primary bitcoin chain. There are 3 groups of people that determine this — the developers, miners and exchanges. The developers have spoken — the majority of developers for Bitcoin Core didn’t want to implement the changes that are inside Bitcoin Cash. Hence, the hard fork. Now, a majority of the exchanges and miners would have to come out in support of Bitcoin Cash for it to overtake Bitcoin Core.
So, the answer is a question of risk. If you have a BTC position, then you may want to own some BCH as a hedge. As an example, if you thought there was a 10% chance of Bitcoin Cash overtaking Bitcoin, then perhaps you’d want to purchase 1/10th of your BTC position in BCH. I can see the use of BCH as a hedge, but not a core position. Of course, things can change.
I still see a lot of competition for which coins will dominate the medium of exchange. Bitcoin Cash, Bitcoin Gold, Litecoin, Abra, ZCash, Monero and others. Bitcoin Cash has faster transaction times and we’ll have to see how the market values that. It’s certainly gotten a new valuation on the back of the SegWit2x cancellation. It will be an important next few months to monitor what the Bitcoin Core developer community outlines for its future upgrades and to address the concerns of its slow transaction times.