Nonsense. As others have said, it is not a zero sum game. Now, fiat is so crappy that it is bound to lose out but that is not necessarily the case just because there is a new decentralised, fluid currency on the block. And of course, if you gamble with trading, you have a chance of losing but that is a choice that is made by the individual.
Those that don't understand the essence of free trade, which is individuals performing an exchange which enhances the value proposition of both, need to meditate on things a little more.