At some point I read an article in which bitcoin was already among the 20 most important currencies in the world (displacing many fiat currencies), so I have no doubt that the growth potential of this market is still immense and we can still consider ourselves as early adopters.
Yes you are right the market is really big for cryptocurrency especially bitcoin. But loses at present and the current condition of the market is something which the investors really do care about. It is business for these investors and to worry about losing is something big in their minds. It is really understandable and pessimism is just a result of it. No matter how you encourage them yet the market is still the same it doesn't change a thing. So maybe we just let them be and those investors may come back when everything will be better though not for now. I am sure of it.