I believe altcoin is still productive, there are many types of altcoins but not all altcoins are productive, but I am sure the altcoins that are in the best coin market list are certainly productive and many supporters, if the altcoin development gets better the altcoin will be more productive and many will invest in altcoin that is
if you want to find product coins you can see the market and look at the daily trade of each coin. and we can get altcoins with good moves for long-term trading and investment.