Unlocking shareholder value, by selling a profitable business unit. You do you Intel.
I doubt it would be just that. I don't think Gelsinger would want the legacy of being the one to do that, unless either Intel's Manufacturing is really struggling (to the point of it potentially ruining the company, in which case Intel's got big problems) or he was forced to (was a requirement to get government chip subsidies).
I guess maybe if he thinks its inevitable and wants to fast track it and get ahead of things and so basically wants his legacy to look more Lisa Su and less Hector Ruiz.
I would hope that IFS is spun off as a pure-play foundry, with complete separation from Intel the design division. It just doesn't seem "fair" to me that Intel receives foundry subsidies from the US government while it is still attached to its design division.
In an ideal world yeah, the amount of subsidies on offer should have come with caveat about having to open a significant chunk of that manufacturing, but as far as I know that was never hinted at, and I'd guess in the US they'd have balked at it even since they'd want to rah-rah patriotism. I'm not sure AMD would've even made a fuss as I can't imagine they're interested in fabbing at Intel if simply for purely competitive reasons (aka, Intel struggling to compete with TSMC), although they'd probably be willing to do so for a partner, but then I'd guess it'd be with older gen stuff. But maybe if they were just making sure not to put all their eggs in one basket or simply out of protest and due to past Intel behavior.