It is hard to predict the future of new altcoin because they need support from people and traders at the market, and the new altcoin needs more time to grow in the future. If the new altcoin cannot get much supports, there will be no future for the altcoin to grow, and the new altcoin will not have a chance to compete with the other coins. And if you want to invest in the new altcoin, you will feel it difficult to scan one by one of the new altcoins to find the potential coin to invest. Perhaps, you only need to invest in bitcoin so you won't disappoint if the new altcoin cannot give you much profit.
The altcoin market is like bitcoin, it is hard to predict. The price of the cryptocurrencies are changing. In able to earn in cryptocurrency, you have to wait for more time in the trades and market. Everyday there are alternative coins that are introduced. If one alternative coin will not have much support the particular alt coin will subside, it will not have a good future. Altcoins without support will not be competent compared to other coins. Investors who invested in a subsiding alternative coins will have its fear on investing again. They will have trust issues and will have difficulty in choosing which coins they are going to invest in the next time around.
For me you have to invest in different coins, especially in bitcoin so that you can be sure that you would earn. If one coin subsides you will have other alternative coins investment. That is wiser to do than investing in one particular coin.