Bitcoin willnot replace the money.Paper currency is accepted worldwide and Bitcoin is accepted by very few traders.Bitcoin price faces high fluctuation whereas paper currency doesnot.Paper currency is supported by governments.But Bitcoin will be a secondary payment option.
I also do not think this is gonna happen but it would be nice if this happened of course, because of the fact that you can than make some nice amounts without any doubts.
The bitcoin will get bigger but other currency's will still have more power due to the banks.