The problem is that NJ's needs, particularly if they are trading Bratt, is top 6 wingers.
Right now they have: Bratt, Palat, Holtz, Sharangovich & Mercer. Holtz is still unproven and really the only high end forward prospect in NJ's system. You could also argue that they need additional depth at center after this year depending on what they do with Haula who is their 3C but a UFA after this season. You don't want to trade a player of Bratt's caliber though for a 3C fix, plus Mercer can always shift to C if needed.
On defense, they're set. Hamilton & Marino are both signed long-term and you have Nemec in the pipeline, so the RD is taken care of. On LD, you have Siegenthaler signed long-term, Luke Hughes on the way later this season and a handful of prospects in Bahl, Okhotiuk, Mukhamadullin and Vukojevic with NHL potential.
Goaltending is still an issue, but should be much better this season with a healthy Blackwood and the addition of Vanecek. Daws and Schmid are a good young pairing in Utica, but neither are highly regarded prospects.
Bratt is still an RFA after this season and the Devils should be competitive this year and at least fighting for a playoff spot. Hard to really see a scenario where Bratt gets moved this season. Hopefully both sides can hammer out a long-term deal this offseason as I think he wants to stay and the Devils certainly want to keep him - this season will give NJ a better gauge of his value following last year's breakout season.