I would personally be heavily concerned about future concussions ending his career, if this one does not do it. Concussions are very concerning, I almost got so scared last year when I thought Hopkins suffered his fourth, turns out it was his third, and almost dealt him away and would not have been a good trade for me.
Someone asked me last week about a trade offer they had for Reed in a dynasty league and what did I think? I told him he's not considering retirement due to this being number 6 but the symptoms could be so bad he gets put on IR again and that puts his future in doubt. Secondly I told him not to give Reed credit for his youth in the deal because if you are playing the odds the concussions issues likely get to him at some point before old age takes it's toll. I look at Reed like a year to year to player. Despite his fairly young age he's someone I value more in redraft leagues than Dynasty leagues, at least that's how I felt coming into the season.
Last thing I want to add, and I posted this in a league message board of mine, is something Stephania Bell said 3 or 4 different times yesterday morning regarding Reed and in an nutshell she summed up what I've been trying to say in one nice concise sentence. What she repeatedly said was the number of concussions is not the issue for Jordan Reed, what is the issue for him is the severity of the symptoms.