I don't think that's quite a fair comparison. The US Dollar and Gold coexist just fine. A new store of wealth doesn't threaten the US's economic dominance. Thou

I don't think that's quite a fair comparison. The US Dollar and Gold coexist just fine. A new store of wealth doesn't threaten the US's economic dominance. Though this is colored by my own opinion that Bitcoin is not and will never be broadly adopted as a means of exchange, but rather only as a store of wealth. As others have probably already mentioned, Bitcoin's transaction costs are very high and transaction time is quite slow compared to most other transactions. One major exception to this is international transfer of small amounts, though I don't think that's enough to threaten government backed currencies.