Holy shit. Is anybody old enough here (Spinal?) to even remember 'Hands Across America'? That was a real thing that happened and was kind of a miracle. It came through New Mexico and my hippy parents made me wake up on a Saturday(?) morning when I was 6-years-old to participate in it. So using that as a story device (I think? If I'm interpreting the ending properly) gets major points from me. It's weirdly half forgotten compared to other events around that time (the Challenger blowing up which I also witnessed live in my kindergarten class and was probably the closest thing to childhood 9/11 moment for me).
Anyways, I think I really like this, but I suspect my feelings are biased due to directly participating in said event. I found the ending weirdly moving and profound. Jordan Peele is my age and probably wrote this after wondering if such an event could even happen today. Twitter and the thinkpiece police would find something "problematic" about it and people would neglect to participate.