You can call uber or lyft while in the terminal and there are dedicated places to be picked up. If its still the same as last year, the area was between the terminals. O'hares terminals are in a "U" so it was just the sidewalk area between them, not a far walk. They fought it for a long time but the unwillingness of Chicago's cab mafia to adapt at all forced their hand. You'll end up in probably a nicer car with somebody who doesn't quite know as well where they're going, but Schaumburg is just up the road.
I like how Axpona claims its in Chicago. Schaumburg ain't Chicago.