There are still alts out there that is still going strong. And I feel someday that the strong alts will dominate the market which will lead on the other coins on losing traction on the market. Which means there will be more dead coins in the future.
Certainly, in the next 1-2 years, I believe that more than 60% of altcoins will die in this market. And only the best altcoins can exist and grow with bitcoin, so be careful when choosing new altcoins, they can die anytime.
Choosing good altcoin is very tough job because, in 2017, most of the coins increased their prices more than as expected, but now those coins are not actually generating volumes in the market and even the team not showing their development activity and this makes the coin is losing its value.