It's almost more funny than sad how such whales can play the market and give so many people FOMO on bitcoin cash. Cause that's the only reason for the current gains, all FOMO.
1. Bitcoin Cash is never going to overtake Bitcoin. If it would have a feature that Bitcoin is missing and really needs, then Bitcoin will just do another fork.
2. Bitcoin has become too much of a household name among the general public. It's the only name the great majority has ever heard of. When they decide to hop on the cryptocurrency train they search for "Buy Bitcoin", not "Buy Bitcoin Cash", "Buy Bitcoin Gold", "Buy Bitcoin x123" or "Buy Waves". If Bitcoin Cash would make regular Bitcoin crash then that will confuse the shit out of the general public and crash whatever trust is building up now, not only ruining Bitcoin's future but the future if Bitcoin Cash and other Blockchain-cryptocurrencies along the way.