If you have the right pieces in place, a rebuild doesn't have to take that long.
Braves started their rebuild prior to the 2015 season, they made the playoffs last season.
Hell the Yankees had a slight rebuild where they basically restocked their farm system by trading away two relievers and never had a losing season in the process.
Here is my question to you because I don't believe in rebuilds. I believe it is a farce. You mention the Braves and what they have done, but looking at all the deals they made I didn't see any real player returned in the big deals as a major factor in today's success. I see they signed/drafted better and added better vets. To me that is just better management. Yes, no?