Well, they are not going to keep down, the time will reach when they will go back up and start increasing again. Even Bitcoin did go back up to $6000 after plummeting all the way from around $7000 to $3900. So, they are not going to stay down for a long time, markets fluctuates and theres always a time for everything. Thats why I keep laughing at people that are selling their coins and running from the market, they forget that this is not a permanent situation and would not have happened if not for all the situations that we have been seeing.
I believe this crypto world will beat the panic of corona and melting down world economy because bitcoin was created for such situation and to react for world economic conditions.