90% percent of the coins may die but the question is how long. 90% percent of the coins may die but in such a period of time, there might be many new coins being released.
All the new coins which are released in a hurry and which does not have any sustainability in the long run due to not much use of such coins will cease to exists and coins like BTC, ETH and other top coins will also be the major player in the market. So choose wisely and invest accordingly.