I am not against a rebuild. Just get the feeling that we need to stock pile the farm system or anything we do over 2015/2016 would just be a bandaid. If we commit to a rebuild, then there are very few players that are keepers. Freeman, Simmons, and Teheran.
Heyward and Justin you trade to the best package available, will only get worse after the start of the season and they become a half year rental instead of full year.
I would listen on Kimbrel to see what kind of market you can get for him. Don't have to trade because he is signed for 3 or 4 more years. But if someone blows your socks off with big talent coming back, you do it. You are not trying to be competitive over the next year or so anyway.
Gattis is not the long term solution. Again, don't absolutely have to trade, maybe wait for the deadline for a desperate team and deal him.
I would look into moving Minor. He is a good talent, probably a #2 or #3 starter, but will be coming close to free agency at the end of the rebuild.
With all of those players available, you can literally build this team any way you want in the future. Stock pile your farm system. Cut cash, then spend when you are close