it is true that the number of altcoins continues to grow, but the really good ones are only a few, maybe around 70% of altcoins in the market are shit coins, so you have to be very careful in choosing altcoins
it is more than 70% are shitcoins , maybe only around 5% as vitalik said. The number of altcoin growing was not parallel move with its quality. Too many shitcoin launched by unexperienced developer team,and also it have no usecase at all. As investors we must care with this case, always do deep research to new project and separate which part is fake and another part is real.