Nine years?! Where did you get nine years from?
It's been less eight since we last won a title, six since we've been in the finals, and four since we were a major contender. Your not rebuilding if you have a team capable of making a finals appearance.
We've been rebuilding for three years, not 9. And in those 3 years, we've set ourselves up for a path to contention better than almost anyone else in the NBA. Stevens is one of the leagues best young coaches. Ainge and him have done an excellent job so far.
Have patience. Rome wasn't built in a day.