I looked at the proposed contours in the engineering packet (available at the link included in original post), and, to me, looked like if anything, WMVP might improve their signal with this move.

The proposed nighttime contours (figure 24 in engineering packet) show new coverage of much of Kendall county and western Kane and McHenry counties. In return, they give up coverage of cornfields in southeast Will county (Peotone), Kankakee county, and Newton & Jasper counties in NW Indiana.

Seems like a smart, cost-effective and well-engineered solution to me. I figured WMVP would end up diplexing with someone when Disney held onto the transmitter site, and WCPT's site seemed like a good fit given WMVP's directional signal.

Yes, AM radio is fading in relevance (and I don't think a law requiring it in cars is going to fix that), but it's not dead yet. Kudos to GKB for continuing to invest in WMVP and not just throwing in the towel like others have (see Emmis and WIBC in Indy).