I don't think many alts would recover against Bitcoin if this happens and so they will crash even more. Some solid alts with good liquidity like Litecoin may recover but most won't recover in my opinion. Thoughts?

We don't need to panic if that happen because we see a lot of time that bitcoin go down the price but still altcoin and bitcoin survive that bearish situatio. Don't think negative when we see the price down because it will cost of panic and worse dumping.
I am quite familiar with the market downtrend and every time the market goes down there will be lots of panic sell investors. That will give Fiat holders a chance to invest again because they can be bought at very cheap prices at the time. I usually tend to buy coins that drop by more than 30% in a day because I know if I can buy those cheap coins the chances of making a profit will be very high.