If CTA is pulling 175 buses (and just as many drivers) off the streets and their schedules to shuttle conventioneers, how can such NOT affect regular service?
The other contrast is the neighborhood. In 1996 the city did a huge amount of cleanup in the area to show the convention attendees what a nice city in renewal Chicago really was. (I was of the opinion that blight should have been left clearly visible, so the city could have pointed and said, "See? This is why we need federal money and your help!") Still, no one, locally, wanted to spend any time near the stadium, considering it unsafe. The point was to get in and out asap for a game. In the intervening years, the area has come up a lot. Maybe there's still nothing but parking lots surrounding (not for long, with the propsed redevelopment) but the West Loop is hot now. There's enticing residential to the west and south. You can walk around the old County hospital location (it's now a nice hotel.) The area a few blocks north is for hipsters, and has a brand new L station.
Generally, at Chicago conventions, charter buses do a lot of work to shuttle those attending between hotels and, say, Mc McCormick Place. But, nights you see them walking down Michigan Avenue or going out elsewhere. I'm thinking that the entirely redeveloped (and yet still underappreciated around town and by visitors) since 1996 West Loop restaurant and bar area is going to be particularly hot next week. This is, truly, a different Chicago which people are going to experience than what they might have imagined or have heard in scary stories.