If you believe on the project you are investing then nothing should be worry, whether it turns to 0 or depreciating in its value, but if you are doing short term investing, then you should be worry by this time. Altcoins in the market performs not the best as we expected, but intelligent ones, taking the advantage of it, by buying below the price, and selling in the high price in due time, so better take your moves differently and take the rides.