To those that insist that "physical" bitcoins have no use, I want to point out the interesting fact that most of the paper USD in the world is used by people outside of the U.S.
Don't forget that many people in the world have limited access to banks and telecommunications. For them, no electronic form of currency is available and they must rely primarily on paper money or perhaps "physical" bitcoins.
You'd still need Internet access to spend the physical Bitcoin anyways. Otherwise, it's purpose would be futile. I don't see how off-chain transactions will work without ever getting settled on the Blockchain. At some point, the person needs to redeem the private key or seed to redeem his/her funds. There's no other way around it.
Using a physical Bitcoin is like going back to the era of paper money. Although the latter still exists, it's usage is diminishing by the day. You can say goodbye to paper money for good once government-issued digital currencies are launched for public use. When that time comes, physical Bitcoins will only be considered as collectibles not as a tool you can use for day-to-day payments. No one knows what will happen in the future so we can only hope for the best. Just my opinion