Whenever Bitcoin price drops altcoins drop harder. As long as there are mostly being traded with BTC that's gonna be the case. You can see that coins such as Binance Coin usually move against the market since a lot of coins are being traded with BNB.
There's a lot of fake volume for sure. Same goes for CoinEx. There's loads of volume due to their token tho - CoinEx Token, it went quite on a bull run a few days back, but the volume keeps increasing.
I highly doubt Bitcoin price could hit $1 million. $100,000 is possible in 2-3 years IMO, but there's long way to go from the technical perspective as well as the mass adaption.