Dirk Nowitzki hasn't changed his mind about being "all in" for this season. Nor has he thrown in the towel on playing in 2017-18, which would be his 20th as a Maverick and has been his stated goal for finishing his career in proper fashion.
The only hiccup is if his body does not cooperate.
Nowitzki was quoted by the German sports magazine Bild as saying that if his body deteriorates to the point that he can't compete the way he wants, his retirement could happen at the end of this season. But, again, that's not his plan.