I'm confused by this statement. The primary use of the dollar is as a currency. The primary use of Bitcoin is as a currency. The fact that so much of Bitcoin's traded volume is used for speculation is actually an issue with excess dollar liquidity available for speculation, not because of some problem inherent to Bitcoin. That liquidity would just move to some other financial product that probably wouldn't make the news because the concept is too complicated to grok, unlike "BITCOIN BAD AND NOT REAL MONEY".