I suspect Firaxis is pinning its hopes on the Switch 2 launch. I was thinking that was a hail mary pass, but I happened on this
Nintendo Life article (link) on the UK retail sales numbers at Civ VII's launch. Granted these are retail, but the split is PS5 47%, Switch 27%, PC 17%, Xbox 10%. You can excuse the low PC numbers since they don't include Steam, but I was surprised at how prominent PS5 and Switch were. Even with a very limited subset of "people in the UK who like to own physical media", I would have expected PC to dominate handily.
The fact that it didn't really worries me. If the Switch 2 does drive a wave of sales, then it's going to be less likely that we'll see any major changes on the gameplay side. The patches up to this point have been restoration of cut features and balance tweaks but nothing that increases replayability. The core game loop gets old after about 3-5 playthroughs, and I was assuming the sales pressure would force some changes. That may not happen, which is pretty disheartening.