I still don't understand this logic, I'm not opposed to it but why bother making so much work for that small thing that will change. Bitcoin will increase but I still don't see any reason to have physicality.
Read OP I think advantages are explained pretty well.
Advantages:
1. No fees - Only fee it would be paid would be in the process of making physical bitcoin and when you would send BTC from the physical bitcoin. And both of these fees can be at minimum, because there is no need to hurry. When you are spending physical bitcoin there is no fee required. The only fee could be from the person who receive bitcoins as payments. 
2. Simplicity - It would finally become simple for old grandpa or grandma to use Bitcoin. No wallet, no computer, no explaining, no electricity...
3. No need to understand everything - We don't understand all the things we use everyday (how computers work, how internet works, how cars work...) but we still use them with no concerns. So it should become same with Bitcoin, we just need to make thing so simple that anyone can use without understanding it. And physical bitcoin is a big step towards this goal.
4. Good advertisement - If anyone can use BTC as payment method with ease it is very good for Bitcoin.
5. Interest - You can start to explain about Bitcoin, blockchain with something to show. Now only people who can use computer are able to operate with bitcoins. If you have something to hold anyone can start from there. This would in my opinion raise interest in blockchain technology a lot. 
6. Secure - If coins would be safe (disadvantage n.1) this would be really safe currency to use. It would actually be backed with blockchain technology which we know is impossible to break, for now.