Bitcoin can not end any currency, since bitcoin is as yet very little famous among us. Half of the world doesn't know what actually bitcoins is and those who know about bitcoin accuse it of a scam. Also, how would we purchase bitcoin if the cash gets end?. We won't be able to exchange. For me, dollars or any cash ought not to end. It might make a few issues and hurt the bitcoin itself as well.
As i have also bet so, bitcoin do have its own significance in an area where it belongs but that doesn't mean that it will surpass or worst end the dollar's reign because dollar still a fiat currency. Though we couldn't predict when the dominance of dollar currency in the world market would lasts but still dollar was a fiat currency and it also excell in an are where it belongs. Maybe bitcoin could become one of the currency exists in the world hopefully.