I don't think this is a fair comparison. When Cedar Fair purchased KD they did a relatively good job of keeping theming elements. The ride themes were still understandable and the changed names still made sense accompanying the mentioned themes. You claim that a rides theming will not be kept up if a return on investment isn't great enough, but KD only had the rights to use Paramounts IP's for the rest of the year after the park was purchased. They could have ripped out all of Backlots buildings, removed FoF's building, repainted Crypt with a solid color and remove all theming, gutted out Boo Blasters and/or taken down the mountain of Volc...a... oops. Backlot is basically the same Backlot it was when Cedar Fair purchased KD minus the onboard audio. Half the shit never worked when Paramount ran the place, but even recently KD has been slowly fixing effects to keep them in order.(I'm looking at you Flight of Fear and Backlot Stunt Coaster!)
If BGW were to get an IP and later lose it, the chances that a shit ton of things would change are slim. Some physical changes, sure, as well as name changes, but BGW has had a history of maintaining its theming and on ride effects and recently have shown the ability to add thematic elements to rides that were built under previous ownerships. While some changes would be made, I'd imagine that BGW would do a better job in updating the theming as the ride ages as opposed to KD.