I dont think so bitcoin is just in the internet,, internet money like.. dollar is hard money that can use every time,,, it is a cash you know not like bitcoin that need a transaction to send some money. and also dollar is more popular than bitcoin many people doesn't know about bitcoin so that it can't replace the dollar.
your statement is correct this time but who know future ...... future can change anything. US is printing USD without care of debt....they run QE3 few years ago.......USD value is falling and falling ..............this time USD is popular but future is BITCOIN only BITCOIN....
USD is reall money - Bitcoin is virtual money