With BTC being legalized tender in more and more countries around the world (Japan/Vietnam) along with increased regulations in Korea, India, USA, along with Venezuelans using it as a store of value in their hyperinflated country, why would it start to drop in value? We're seeing major upticks in Africa as well. That's fundamental value right there? Whether BTC is the old horse here or not, it's the one the world is betting on and where significant capital is going.

For BCH to overtake BTC or for the new upcoming hard fork of BTC in November to overtake BTC would require something cataclysmic to take place. That's not to say the forks can't survive and thrive. But I think you underestimate the power of BTC with enthusiasm over BCH and other cryptos based on their very recent gains.