What would happen if the Worlds economies all decided to use Bitcoins in place of the USD?
Bitcoin would collapse under the load far before the entire US economy changed over to bitcoin, let alone the entire world economy.
https://en.bitcoin.it/wiki/ScalabilityAnd, assuming we did somehow make bitcoin about 100x more scalable than it is, sometime before the entire US economy transferred over to it we'd have bitcoin heists which made the recent mtgox hack look like pocket change.
Honestly, I have never seen any place anywhere on the Internet where the term "troll" is abused so much. It has become synonymous here with "BTC skeptic", and that is not what it means. It means someone making false comments with the intention to deceive. To disagree with the majority is not trolling. It is discussion.
Skeptic: I'm not convinced BTC is the best new thing.
Troll: Bitcoin is shit. Why are you using it?
Quoted for truth