Just hold both your BTC and BCH. If there really is a back room conspiracy for BCH to take over from BTC you will be able to see it coming, just watch the hash rate on both chains. Since the Chinese mining cartel controls the majority hash rate you can not rule out a black swan event.
The mining cartels won't be willing to sustain losses for long though and there will be quite a dump when it happens.
I'm not of the belief that the money follows where the hashrate is at, it's more like the hashrate follows the money.