Altcoins are risky because most of them arent necessary.
There are some altcoin that are worth investing in. ETH for example is down right now but it is the market that is down and not the technology. Similarly, Litecoin is one potential coin that is also being suggested by the experts to keep it as part of the portfolio.
I think this fall has thrown out many coins from the market that had no good project on its back and were actually ruining the cryptomarket. In the end, the fittest will survive and will start the journey of future.