The question that will likely follow the New York Red Bulls for the entire 2017 season is "was trading Dax McCarty the correct decision?"
As is almost always the case, a question like that is going to have a different answer almost every week, and probably stops being worth asking almost as soon as the trade is made. All trades are made for a reason, usually for a reason those involved think makes their respective teams better. Understand that reason and you have your answer to whether the trade was good or not: you either agree or disagree with the trade when it was made, after that you're simply applying a lot of hindsight - and all parties involved in the trade probably agree with you anyway, since they also have seen whose guess was best.