As for the receivers, I'm not sure that's a major problem.
Against Clemson, there was plenty of separation, and Wilson was throwing to open receivers all night long. Obviously things were a bit different against Tulane, but that was just a bad night all the way around. The receivers were often sloppy in route-running, they dropped a few balls, Wilson missed some open guys, and he was pressured all night long. Again, I'm not sure it's a major problem as much as it was just a bad night all the way around in the passing game.
We'll just have to see how things develop. We struggled against Tulane, but things looked great against Clemson, so it's hard to say definitively one way or the other. If things persist like they did last week, it's obviously a problem, but we don't know if that will be the case or not just yet.
I do think the lack of big plays in the passing game has created some issues in that regard. When it takes a decree from the Pope to get a pass play of more than 15 yards, that really allows the pass coverage to squat on the shorter routes and really compress the field. We saw a ton of cover one and cover zero this past week against Tulane; they were betting we couldn't hit the deep routes, and we couldn't. Wilson misfired on a few, and they got pressure on the others. Again, it all allows the pass defense to compress the field and squat on the shorter stuff, making it tough to complete passes and get YAC; that's essentially what happened against Tulane. That may look like it's a problem with receivers not being able to get separation, but in reality it's all a failure caused by an inability to stretch the field vertically.
Either way, I do think that is a part of the problem, and it will probably be an issue until we can successfully hit some big plays in the passing game. Once we do that, we'll stretch the field and create a lot more space for receivers and passing lanes. Until we do that though, defenses will be able to keep things pretty compressed, and we'll probably continue to have some struggles throwing the football. That's not to say the that receivers aren't a problem, per se, but it's a problem regarding our inability to stretch the field vertically, and not necessarily a problem of a lack of separation.
Again, if you allow opposing defenses to compress the field and squat on everything, you simply aren't going to get much separation regardless of what the receivers do.