The thing for me is Inciarte is a very good player and is valuable. But, his value right now is to keep a bad team from looking marginally worse. It's not like the Braves are one player from contending. Most would agree that they are probably at least a year away from fielding a reasonably good team and probably 2 years away from possibly fielding a playoff team.
So, Inciarte's value is being wasted with the Braves right now unless you put stock in the value of 2-3 wins more on a bad team being worth having him around. Keep in mind that no one is suggesting that he be just given away. But Inciarte's true value to the Braves will either occur at the time the rest of the team has caught up enough to be competitive or whatever his trade value is in bringing back talent that has value at the time the rest of the team is competitive. He's not a face of the franchise guy where you build marketing campaigns around him (even if they should they aren't, better Inciarte than an unproven Swanson). He's not a casual fan draw.
He's an excellent baseball player who's peak value will likely be wasted while the rest of the team is trying to become good enough to actually win anything. He may still have really good value in 2019 and 2020 but his birthday is October 29, 1990 so in 2019 and 2020 he will have already peaked and be starting into his baseball physical decline. And, that's all assuming he doesn't get derailed along the way due to injury or other reasons.
IMO, you have to build for where you will be, not where you are when you are rebuilding.