The Altcoins have a future, but we still do not know what the future will be like, it can be a good future or a bad future, but, nevertheless, it can depend on who holds them.
I don't want to generalize the future of altcoins, some alt coins are performing well for the past years but most of them aren't.It's very easy to say that the alt coins has a future but we don't know on how many of them can survive. Some are doing good and remain constant with their performance but others, the longer they have been in the market, they are more to be dumped.
, it's primary trend is down for more than a half-year. Even current intermediate trend seems rising it may eventually end with as previous bottoms. Last time btc rised altcoins didnt rise well. They still have time to rise but when btc starts to fall it will take altcoins with it. So if you have short mid term investments on altcoins prepare for exit. You can catch a last ride oncoming next weeks parallel to btc run. while exiting from altcoins do not calculate them with /btc prices just think them as /usd so that you can see your real profit. Even if you are in lose i recommend you to exit. You may enter later or never.