The thing that pushes us forwards is more and more business adopting Bitcoin as payment.
It won't become a real currency when it swings +/-10% in the time it takes to confirm a transaction. Bitcoin is completely useless for commerce as long as it's having days like this, it's a purely speculative instrument, nothing else.
The chance that a micro bitcoin payment is made twice is so remote, that any commercial party will accept the payment merely by it being registered in the network. That happens literally in seconds.