It's correction time.
Even if we are correcting, the money seems to be flowing out of Bitcoin and into Bitcoin Cash. The original Bitcoin holders ate not losing much. But if you took a punt and dumped your Bitcoin cash, then you are exposed to more volatility.
It's nothing new - money has always flowed back and forth between Bitcoin and altcoins. Personally I'm only interested in owning Bitcoin. I've missed out on plenty of altcoin and ICO pumps - but I don't want to play that game.