After this big crash there are too many bag holders and people will sell every chance they can get.
Well, what we have experience today or it will take few days to recover the downfall of price in all altcoins are basically the flow of demand and supply. This will lead to a big crash because the bitcoin is finally increasing in resulting to many have sell there coins so a lot of supply in a market making the price will dump into a very low price. After all this big dump it will reverse it with a green price in a market.
Early months in the year will be the time for altcoins and not bitcoin as it is seen every year. Bitcoin shall remain stable now need 10k$-11k$ for some time in that period of time alts will rise and dominate the market, but after some time bitcoin will rise and the alts will crash and most probably we will see a new all time high in bitcoin.
The volume will increase slowly after the crash in over and it may take 2-3 months for crypto market to recover properly and make new all time highs.