Not all alt coins have future but good ones like ripple, ethereum, IOTA do!
it looks like the future of altcoin depends on the ongoing roadmap or the calendar events associated with the altcoin
And whereas altcoin that even after entering the famous exchange,nd after that there's no news will just be dust
Then before you buy altcoin you should see the background of that coin, maybe you can start from when they become ICO, you can see their roadmap, their project, and so on. indeed there are altcoins to die because dev aim only once pump then do not have any price in the market, so be careful to choose a potential altcoin, but I see a lot of ico keep coming and then become altcoin, i think altcoin will still exist and have future, yeah agree but not altcoin have future, just a potential altcoin only that have future