If you haven't been following the news closely about the Cubs renovation proposal, part of the plan is to build a hotel across the street from the ballpark (on the site of the current McDonalds).
Details are here.
I've got a gazillion dollar money making scheme for them once the hotel is built. Everyone leaving the ballpark (except those with valid mass-transit passes) should be forced to take a breathalizer test. If they fail, they've got to sleep it off in the new hotel until they're able to drive.
That's a free one, Mr. Ricketts. Better build a highrise.