If the Japanese can implement these policies, they will remain 2nd or 3rd in Asia depending on India's development.I have never seen any country recapture the market eaten by Chinese enterprises, and the same is true of new energy vehicles.
The Japanese govt will certainly implement the measures you said, and the Japanese economy will eventually stop falling. But that must be after the yen depreciated by more than 40%. Japan's per capita GDP will drop to between $20000 and $30000. At this time, Japan will be the country with the lowest per capita GDP in East Asia except North Korea. And they will rely heavily on China's industrial chain.
Now the biggest trouble for the Japanese is not only from Japan and China. Now American hedge funds have shown their teeth to the yen, and the USA is ready to eat this ally to make up for its broken economy.
Higher wages and lesser overtime means more birthrate, which will stabilize their domestic market self-suffiency, and thus leading back to virtuous work and consumption cycle.
The yen decepreciation can be a boon to Japan as long as companies issue higher wages. Japan high growth period was when yen in the 300 range but wages back then was higher.
I fear, again, right wing Abe force will never implement these policies and pour more fund into US weapons again.