Also, it's not all coins. There is a small number of coins in the green right now, you can find them on coinmarketcap. Those are serious uptrenders, going against the flow even when all the market is bleeding. Watch them closely.
Correct and agree with your point. Bitcoin is expected to bounce back in a week or two, Bitcoin wouldn't bounce back where it was but more than that (Approx $20,000). Bitcoin is the mother of all crytocurrencies and the trend on this whether upward or down may impact other Altcoins but not all.
Just to keep you updated that Bitcoin Cash and Bitcoin Gold is in a positive trend. (44.06% and 23.65% upwards respectively) These Altcoins are part of Bitcoin.