I need help with this one, and I'm not a pilot.
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First, I think it's highly doubtful that the airstrip will open back up. That being said, I don't see how the monorail, which is below the tree line and a good bit away, would be a problem.
If the Monorail is a problem then wouldn't all of those trees be a problem first and, while I could see them mowing some of them down, I remember there always being a "tree border" between the road and the runway. I don't ever remember being able to look directly over at the runway.
Second, while not on the ground the Monorail isn't particularly high up in the air here. To me it'd be like planes not being able to land at major airports because there's a parking garage within 1mi of the runway.
Anyway, correct me if I'm wrong but I just don't see how the Monorail would have any sort of impact... Unless the lights on the top of the Monorail are too close and could be seen as confusing the pilot in adverse conditions.