Would be a damn shame if Chicago suffered from a second false start. I believe the original planned service on the Jumbo got pulled at the last minute as well (due to 9/11 I think?). Hopefully it doesn’t take another 19 years!
As for network changes, I’d expect to see further frequency drop, aircraft downsized where possible, maybe schedules rejigged, but most destinations retained. If only we had more 787s sitting around...the aircraft utilisation is through the roof already.