If you are expecting physical coin for bitcoin then what will be different with traditional payment system? There is physical bitcoin but it's just parabole, not for real uses. If bitcoin create for real use then its will be centralized and bitcoin itself is decentralized. So can't be use real bitcoin in future. The creator of bitcoin is still anonymous, then who will issue real bitcoin. Its impossible in my opinion. Also there is limited supply, when it will manufacture in real life then anyone should print it unlimited, perhaps people will create fake bitcoin and we might so many problems about real bitcoin. I strongly believe it will never happen and it wasn't goal of bitcoin.