I don't think the injuries have taken a toll on him physically. He was still mobile and strong this year, but he just started making uncharacteristic mistakes throwing the ball away, some of that can be tied to limited training camp and unfamiliar receivers, some of that was due to the O-Line problems and the subsequent pressure, but I'm not making excuses for how badly he played. I think mentally he might have gotten the yips due to the injuries and the increased pressure due to the O-Line, but then again, Doug did him no favors in trying to take advantage of Wentz's strengths, like quick short throws, like calling roll outs, where Wentz is great throwing on the move, or running the ball so that play action would work better. I think Wentz could regain his form if whoever the offensive coaches are would make those changes to the offense to work to his strengths and build his confidence back up.
I like Hurts, I think Wentz still has the higher ceiling, and adding more picks is more important than Hurts' value to the team next year, so that's why I think they should trade Hurts. Having three top 100 picks in the next draft would help a lot (unless Howie passes on more great picks to try to outsmart the league). Also, I worry about Hurts and his future heath the way he takes a pounding, he's not a huge guy. Trade Hurts, trade Ertz too and build some draft capitol. I think the O-Line will be better next year with Johnson and Brooks back and Mailata showing promise, Dillard as depth at tackle, Driscoll looks like a player too so they'll have depth, so keep putting talent around Wentz and fill some holes in the draft.