what is your definition of "success"? Is the divergence between productivity and wage growth success? Also, over and over countries have tried to stimulate their economy with the printing press and had some rather... unsucessful experiences, with extreme examples being yugoslavia, zimbabwe, venezuela. And some more mild but still painful experiences including brazil and argentina.

Predicting timeframes is tricky. An inflationary spiral by its very nature is an exponential process, so you can seem fine for a while and then all of a sudden there's no way out except through a singular process and things are really bad.