Edward Hugh has a good post on this topic, here is one excerpt:
…there is simply no way incomes can rise across the entire economy because the baby boomers are now retiring to be replaced by fewer young workers with post labour reform entry-level wages. Japan’s overall consumer spending power will therefore fall, rather than rise as Abe hopes. “Individual companies may offer wage increases, but because of demographics it is simply impossible to increase the total amount that is paid out in wages,” says Obata. “On the contrary, that amount will shrink.”
And Japanese exports, after an initial boost, have flattened out, not good news. Here is a further Edward Hugh post on the Japanisation of Europe.