With Aiken, it sounded like he was frustrated with his role on this team. Can't remember the comment specifically, but it was something along the lines of "Am I disappointed with my role on the team? It is what it is. I have to try harder, etc." If Aiken is frustrated with his role on the team, especially in a contract year, he could leave simply out of spite and go to a team like the Rams who have even less depth at WR. That was my main reasoning. Can't argue that the need at WR on this roster isn't there with SSS leaving. He could be back, I wouldn't rule it out.
With Juszczyk, my reasoning is that not all OCs use a FB. Now, granted, Juice is a dynamic kind of FB compared to your throwback run-blocking FBs, which makes him much more useful overall, but fact is not every team even carries a FB (some just use an additional O-lineman or a TE), so Juszczyk may not be considered useful to our next OC. Alternatively, if our next OC really values a run-blocking FB, then they may want to move on from Juice, since he isn't the best from a pure run-blocking perspective. That's why I think it might depend on who our OC is in 2017.
I think the only way Doom isn't cut is if he accepts a paycut, which is actually equally likely now that I think about it. However, with a base salary of 6 mil, there is zero chance he stays here with that cap hit, and his foot injury makes him too risky to extend, so he's either taking a pay cut or getting cut. Yes, we need rush-LBs, but right player, right price.
I think Zuttah is probably here if he continues his improvement from a dreadful first 3 games of the season, but if we draft a C high, or if Zuttah goes back to struggling, then it becomes a question.