Many altcoins have a potential and productive in the market. You just need to choose the best for you. In the future this will be more and more. Now the people tends to invest in altcoin than any other business. becasuse they know about the future.
Of course many potential altcoins last for a long time, but with the increase of altcoins and now more than 1620 registered in coinmarketcap it is certain that it will make the competition very tight and will make many disappeared coins.