In my opinion, it's very likely that they will just build a bigger nearby supercharger in a more commercial area rather than expand this location. Is there even anything to do within walking distance of this supercharger/service center?
In Burbank (and possibly Montreal), they built bigger nearby superchargers at malls and then de-listed the service center superchargers. You can still charge there, but they aren't listed on the website or in the Nav. I assume this is because they would prefer Tesla owners to stay out of the way of the service center and its employees and charge at the bigger, newer nearby superchargers.
Actually now that I look, they actually have put in superchargers at Skokie, Glenview, Rolling Meadows in the last couple years so there you go. I realize that might not be as convenient for you if you live right next to this service center but those are the breaks. They will likely build more supercharger locations further north in the Chicago area, but in the meantime, you can either charge at the new superchargers or use this location afterhours. Or charge at home of course.