The market has realized most of these coins are worth nothing and the promoters have no intention of developing the ecosystems
That's true. There are hundreds of altcoins on the market and I am sore that less than 10% were actually created as a new idea to help the world and not as a business strategy just to make profit from trading it. But as it seems they are holding up well because people keep trading every coin and that's going to continue since people expect to make a big profit from every single coin that is created.