Yes, of course, altcoins are listed among the futures trading options with traditional brokers and exchanges and many of them have huge daily trading volume. This can only mean that people are trading them, and if they are not good for trading, people will not dare to do that. But still, investment advice shouldn't be general because what I prefer might not be what others will prefer. For instance, as volatile and risky as Gold is compared to many other assets in the FX market, I still love to trade and I've considered it as my most favourite asset in the financial market. What I can advice you to do now is to first establish the kind of trader you are. You should know if you like a slowly moving market or the fast ones. It is from here you can know what to choose among the altcoins for your furures trading. That's if you will choose any of them at all because I consider most of them more volatile than Bitcoin and Ethereum.