Earlier quoted context omitted.
Japan is sui generis - if you don't really want to become "of Japan" I can't see a good reason to go there for more than a short sabbatical.
I mean eventually I want to learn the language right? The point is there will be a period of time where I don't know the language and hang out with my fellow ex-pats. Additionally I will never ever really actually master the language to the point where I'm indistinguishable from a native. I'm just wondering is Japan bearable under these conditions?
On average, the country and its people are incredibly inviting and kind to guests and appreciative of foreigners that learn Japanese. However, you will always be viewed, by the vast majority, as being a guest - even after many many years and fluent Japanese.
And some people are fine with that, and some people can't stand that.