From Chris's verbiage, it seems like he thinks Bethesds would be resistive to sharing the IP. Which seems silly. They literally already shared it....with Obsidian.
They did, but it wasn't 100% willingly, speaking as someone who was in the room listening while the "challenges" to sharing it were being discussed by the Bethesda heads.
It's like saying BioWare "shared" the Baldur's Gate IP for Dark Alliance with Black Isle. They didn't. And BioWare wasn't happy they weren't able to weigh in on that, it caused a lot of problems at the studio. Did it do well? Sure. Could it have been handled better? Yes.
The point is, a studio's IP is something a studio (esp. creatives) feel strongly about, and to pass it off to someone else without strong oversight is hard for some to do, and that's normal. You want to protect what you care about it, not see it distilled or tarnished.