The quality of altcoins is improving at the top, especially tron, litecoin, and others that have continuous development. Bitcoin will still be at the top though, it is simply digital gold
It's not about quality but greed. Bitcoin isn't offering big profits anymore as it's becoming less volatile. Traders are all about volatility and pumps and dumps even when they are a bit too risky.
Why do you think shitcoins that have no real life use and not much of a community are still receiving investors. What draws the average Joe to Elastos or Kin when there are much better projects to choose from? A hope that somebody will pump these low market cap coins and allow them to make money.