You forgot to add that new altcoins are more risky investments than already established coins. There is also always the possibility that you can buy at a lower price than at today's.
see first whether the new altcoin has good fundamental or not, you can see Eterbase, Emirex, Tokoin,
they are new projects that have good quality and are considered good for mid-term investment
Every coin has advantages and disadvantages, I also think so, and many considerations in altcoin investment. But if altcoin is going to strengthen again, why not? Surely this will be a new solution to invest in the future.