My advice to all altcoins investors is not to panic ,these people as popular as they are can't predict the future, last bullrun of 2017 no one saw it coming and the last Almighty altcoins season of January 2018 no one ever think that will happened.
Not all altcoins investors are facing the feelings of disappointment, you are wrong about the feelings of investors of altcoins, because there are some of it, knows what they are entered into crypto world. Perhaps, those investors who got disappointed are not deeply mature in crypto. don't they know that crypto are volatile.