[Mr Downtown]

I can't see the Dept of Aviation caring about protecting CTA, a completely separate unit of government. I think it's more that a) this is a facility for rental cars, paid for by rental companies, and the proximity to the NCS station is an accident; and ii) any real Metra O'Hare service—if it ever comes—is more likely to use MD-W, which Metra actually controls and could add more trains on.

The smart short-term Metra Express play would be to simply run a shuttle bus from the terminals down (usually free-flowing) Mannheim Road to the MD-W Mannheim station.