Points 1 and 2 do not require the change of the family register laws, under those, it is perfectly legal for the husband to take the family name of his wife. It is just uncommon.
The restrictions placed on the royals are entirely the result of the Imperial Household Law of 1947. The changing of said laws would not affect the general public, since those laws are specific, passed to govern one specific thing, which is the Monarchy of Japan. Thus, any change to them would only pertain to the inheritance of said Monarchy, and nothing else.
As for point 3, that is why I phrased it as "bringing back adoption". Legally speaking, children of concubines were illegal. What made Taisho a viable crown-prince was the fact the Empress adopted him after he was born. Keep in mind we are talking about the father of the Showa Emperor, so this is not ancient history. Showa Emperor himself was urged by his court to take a concubine after his wife failed to produce a male heir, but he declined, and afterwards the Empress gave birth to two sons. Concubines were never a legal institution, they were just imperial mistresses, usually with ceremonial titles conferred to them at court. Hence why their children were adopted by the Emperor's wife. Mind you, do not misunderstand, I am not actually advocating this, merely pointing out that such a thing would be possible if the Imperial Family is allowed to adopt a potential heir. The question is how the public would view this. On the one hand, these are the modern times, as you said, on the other, this is Japan, which has a remarkable tendency to not evolve its mentality, and the practice of imperial mistresses was abandoned literally by the previous Emperor, Showa, whose own father and predecessor, was a child of one such mistress. I literally have no idea how such a thing would be viewed, but if there is any place on Earth where it would not surprise me too much, it is Japan.
So, on the one hand, amendments to the 1947 laws in these terms would actually bring back some of the more traditionalist elements, rather than something that could be viewed as more modern, and would, probably, appeal more to the traditionalists, many of whom as of late seek to revise much of the Constitution (informally called the MacArthur Constitution, since it was basically drafted by the Allies, you can see why more traditional elements would like to see it, and the 1947 inheritance laws, changed).
And since the laws of the inheritance of the throne are so specific, effectively governing just one thing, unconnected with every-day legal problems of ordinary citizens, I doubt their impact, however indirect, would be something worth considering.
This could lead to a whole off-topic snowstorm, so I will stop now...
last edited at Aug 2, 2017 2:28PM