It's not like it hasn't happened before anywhere in the world. The exceptional thing is the enormous amount of trust that developed markets have in the central bank's technocratic policies. This trust was built up during 70 years of relatively high stability (and growing complexity and obfuscation of the monetary and financial system).
For now the BoJ still has room to abuse this trust and make a mockery of every form of market-based risk analysis, valuation and price discovery. But at some random point of time, the trust will just break. Even in Japan no amount of measures will stop the market's instinct for self-preservation as yen holders flee to other assets.
Japan is ahead of the rest of the developed world in this. The Japanese experiment will put pressure on currencies and interest rates in all other countries who are facing a variation of the same problem.
Most important: all this will happen in a country (or world) full of pensioners. Shikata ga nai.