Russ holding the ball too long is complicated. It's not just a simple yes. It's more like -->WHY<-- does he hold the ball too long?
#1 reason Russell holds the ball too long is his protection is disrupted up front, and he is moved off his spot. Remember he needs space --> he is only 5'10". So he will scramble, get that required space, reset, and make the throw.
#2 Play design, it is pretty amazing how many times a play is called, and there is no outlet, or hot receiver. I guess the thinking is everyone go deep and then let the scramble drill commence.
#3 Pete Carroll is in his ear constantly to not take risks, and do not turn it over. So unless it is wide open he is gun shy. When you have a Championship level defense it makes sense to a certain to degree.
#4 Happy Feet - He doesn't trust his protection at times (Would you?). So he will scramble out unnecessarily & hold the ball w/no outlet or hot --> leads back to #1 & #2.
#5 The Play was DOA. Whether the Defense guessed right, or it was just a bad play, Wilson will scramble and see if he can salvage it (which is a good thing). Others would just throw it away, because they aren't RW.
#6 He didn't see it --> because he was looking somewhere else (this happens to all QBs).
#7 He didn't see it --> his view was obstructed (too short). This doesn't happen as often as his haters would have you believe, but it happens at times.
#8 Wilson is at his best extending the play which requires holding the ball.
Some may want to debate the ordering of these reasons, but it would be semantics.
Bottom line: If the protection up front is improved (#1), and the play design is tweaked (#2). The complaining about RW holding the ball too long would go away.