For that bitcoin should get accept worldwide as payment gateway, Paper money is now largely used. And that will not change later. I also know that Bitcoin will be more used now in the future.
But many people need also their paper money, because some people dont even know what Bitcoin do, so first we must promote Bitcoin.
Of course we need to promote bitcoin and make more people adopt to using bitcoins. We also need to promote it to businesses as an alternative payment schemes. More people using bitcoin, the better. Time will come when we can use bitcoin as easily as we use fiat now.