So with no ownership over bitcoin, I'd expect cryptocurrencies to never be widespread in Japan. Then again, we don't know hoe valid this order is and how seriously is going to be regarded.
The only thing you need to own a bitcoin is to hold the private key. The government cannot do anything to change that basic fact.
But then again, what happens if you can't pursue third party services for stealing your bitcoins, overcharging etc. I don't see Japan being a good place to start a bitcoin related business after this.