Well, having a physical coin of bitcoin isn't that a bad idea. However, the bitcoin is meant and made to be digital and that was the thing that made it unique compared to all form of currencies. You can always put addresses to the coin but for me, it is just a waste of time and money. Since it will always run with a computer/digital. Indeed, a person will not accept a physical coin until he can verify it online. So the point of having a physical coin is nonsense.