Holding altcoins will not be dangerous as long as its under top 100 listed of CMC. The market is in deep and one day it will going to recover from this deep, that is for sure as tons of money is involved in the crypto market. Also a lot of Venture capital & institutional investors are showing interest in the Blockchain industry and when they will involve fully then cryptocurrency will easily hit mainstream. We are still in the early stage of the blockchain technology and if we hold Good altcoins even new Coins if their technology is good than it will be beneficial for us in the future.