Trading altcoins is still profitable and you can still make good money from investing in some of the coins. Many of those coins are at the buying angle of the trading circle now and you can take advantage of this in other to be able to invest in them. However you should do your research very well in other not to invest in wrong coins.
Trading altcoin will be profitable only if that coin is into bumping phase. Because only the dev teams are the bumper. I mean when most of the altcoins are lagging with real time application, how we can expect most people to buy it. When we are considering bitcoin, we can expect all the people from around the world will be buying it so that it will be into bumping phase most of the times. At the same time, altcoins are risky if the owners decided not to bump for time being.
Fortunately many people are sharing here that they are finding big profits by trading altcoins. But I do see these are all only because of their luck because if a coin is not having any real time usage then we cannot make profit by trading it.