Ignore him, he is just trolling.
Bitcoin as an experiment is a huge success. The question was whether something like this backed by nothing can have actual value, and the answer is a resounding yes.
Not exactly backed by nothing. It is backed by utility. As long as it provides enough value by saving fess, being yourself the real owner of your money, fixed supply, faster international payments, online blackmarkets, online gambling, and so on, it will have a price. The day bitcoin won't provide any advantage anymore, well, that day bitcoin will be dead, but that is far far away.