Transactions would imply some sort of currency. If you're willing to use fiat, then it has it's own problems, as it keeps accumulating debt, which cannot be resolved entirely without breaking the integrity of the system.
Other forms of crypto-currencies have one or another form of overseeing authority, which might not be censorship resistant.
So Bitcoin is really an ideal form of money, that we could possible have.
Do we need one? Everyone decides for themselves.
Yeah, but most of us get paid in fiat and have to pay our bills in the same currency. What benefit does changing into a different currency have for this? So maybe for my savings then, but I'd have to have faith in bitcoins as an asset, and as per original post, it's not gold, its a tulip bulb.