in 2 or 3 days from now the price will be back to normal because ,in my opinion a lot of peoples are scared not to lose everything . But it is not a good thing altogether because it will decrease the number of cryptocurrency holders by 5% -15% maybe more ... tell me your opinion about this . 
No, you don't need to scared about it, it is normal up and down or and also i am disagree with you that holders of crypto currencies are decrease as you mention 5% to 15%, WHO said you?
You know when bitcoin price go to high then mostly holders start to sold their bitcoins and in this moment bitcoin price go to down, but when you will see later on bitcoin price go to up then people hold their bitcoin, So it is circle and it is continue every time. Now you should see bitcoin has started to go up.