The Braves are currently on pace to win 55 games. They are quite possibly the worst team of this young millennium. There is simply no way a team improves by 30-35 wins in a single offseason.
If all the following things happened, the Braves MIGHT be an 85 win team, and just miss the WC game:
1. Trade for Lucroy.
2. Sign Cespedes for LF.
3. Sign Desmond for 3B.
4. Acquire one more 3 WAR starting pitcher.
5. Promote Swanson and Albies.
6. All acquisitions and Freeman and Teheran at least repeat their 2016 performance.
7. Folty and Wisler take steps forward to be 2+ WAR pitchers.
If ALL those things happen, the Braves can be an 85 win team next year. Needless to say, all of those things will most certainly not happen.
This team isn't going from 55 wins this year to 85-90 wins next year, no matter how much you want it to happen. They can, and should, incrementally improve to 70+ wins with some modest FA acquisitions and promotions, and then challenge for 85+ wins in 2018.
The amount of talent required to obtain Lucroy for 14 months would completely undo all the rebuilding they just spent years doing. So unless Coppy somehow steals Lucroy, acquiring him would be a terrible, horrible, idea.