I would say change my mind but that would be a waste of time because it would be impossible to do so.
Maybe it's still my tourist goggles from getting back last week as a filthy American, but I've never been so astounded at how such a massive city can be so nice, clean, and well-oiled, while also being extremely vibrant and fun at the same time.
I'm sure there are downsides to living there, but with technology making things super easy for getting around the language barrier, I'm really struggling to think of anything. Not was was I thinking, "hmm I like this back home more!"
EDIT: And cheap too. Maybe it's because the yen is weak, but everything was insanely cheap by comparison.