Societal renovation worked well enough in Meiji and the Occupation. Especially well if you weren't the ruling class, so much as just one step down and got to take over. Too bad about the cannon fodder...
Too bad 'the third time's [not] the charm'. Never mind the log-jam that is modern Japanese improvisation to 'outside context problems' of any degree. The debts of the Bubble have still not spun-out, because "the perverted golf-club" kept them out of play, but they cannot do that for ever. There's domestic demographics:
The fact that it's an unenviable place for workers to come, even if they were wanted, much less wanted as immigrants: permanent and full members of Japanese society, like many other countries offer to most immigrants.
Japan will change it's attitude, politically and socially, to immigration, and I would guess they will do it within a generation, by the look of those demographic kites. It's amazing how tolerant mouth-breathers can become once there's a fraction of the people paying into social welfare, a multiple of people drawing on it, and they want a share. Except, who'd come then? What's Japan going to have to offer immigrants in ten to twenty years, much less in the 2050 of the third chart? It already has a great deal less to offer than quite a few other places, not just in the 'First World', but also in some 'Emerging Nations': often the immigrants' home.
I shouldn't take pleasure in this, because it is petty, and I have family and friends here. For them I am concerned. But Japan? Japan's brought it on itself with sight of it from far off. Japan won't ever accept my children as fully Japanese. My white ass has had some privilege by it but also a great deal of aggravation.* Fuck Japan! I'll enjoy my Schadenfreude.
*I'll thank Japan for giving me some experience of crap visible minorities put up with in my own country. Enough to have put fair peers of mine in their place in front of the less fair. You taught me how bigotry feels. Good job Japan.