Think there's some element of FOMO (people afraid that BCH could overtake BTC) as well as people not realizing they have BCH keeping BCH from crashing.
I don't see how BCH can conceivably overtake BTC, or even come close to it's market cap. BTC is accepted all over the world - there are even BTC ATMs. They way cryptos continues to grow is through mainstream adoption. While main-stream adoption is still in it's infancy, it has a significant leg up on all competitors, including BCH. I don't see what BCH will be used for aside from speculation, which makes it ripe for an eventual crash.
Some of the richest people in crypto are BCC creators, miners, etc. Something to think about. But I agree, probably will fall to sub $100 eventually.