Certainly this is not the right time to sell alt coins infact now is the time to buy and make investments because alnost all altcoin are at their lowest price!
Every cryptocoin cannot survive as different coins have different potential! Those with nice project line will survive and rest will ultimately fade way!
All coins are dipping becauae Bitcoin btc is dipping since all exchange list mosty coin/btc pair and thus coins also dip also major holding is btc in total crypto investment over the world!