That's my mistake, I accept the reason behind the price down of altcoin is majority coins are decentralized they had a huge impact of Fluctuation in Bitcoin 24 hours High & Low Volume, In simple term if there is huge changes in number of satoshi Increase or Decrease the altcoin affect directly or indirectly unless and until the price of bitcoin, High-Low Volume of 24 hours STABLE in certain Bracket of 500 to 1200 Satoshi Up & Down.

So, the point is mostly those coin effected which are decentralized they will not survive the wave of rapidly changes in bitcoin price.