I don't think it is possible for Bitcoin to loose all its value as many people believe in Bitcoin and they have invested their money in it. Bitcoin is only growing and gaining popularity everyday so we can only expect growth from it. Minor pumps and dumps may be possible.
Minor pumps and dumps on market very normally, if don't have the volatility on marketplace, how to trader earning money from this place? So, don't let small dumps make you worry about the future of Bitcoin 