Ya blame the society not your sport & its promoter centric model ("I am watching Top Rank on Saturday bro" said no Boxing fan ever)
You clearly don't know shit about Boxing in Japan (it has the 3rd most champs behind US & Mexico) & Inoue didn't come out of nowhere. Before Inoue, there was Ioka, & after Inoue there will be Junto Nakatani & likely Hayato Tsutsumi. Murata Ryoto would have been a bigger star than Inoue if he was more active & didn't fall short of being a world class talent with his loss to GGG
Boxing's growth & survival isn't tied to some promoter. If Inoue's current promoter Ohashi promotions died, that wouldn't put a dent on Japanese Boxing's ability to continually churn out world class talent as it has been doing since the days of Fighting Harada
So clearly, there is nothing wrong with Japanese society as it continually churns out world class talent in Boxing but MMA is largely irrelevant with Pride's collapse, there is something wrong with your sport though...