What made you think Sarah Bond would survive? She is the current Head of Xbox. If Xbox dies she is tied to it by the hip.
On the other hand Phil Spencer is head of Microsoft Gaming. He can wash his hands of Xbox hardware and continue to run the software division.
Yes, there is rumor of Sarah taking Phil's job a few months a ago, but that had assumed that there will be a new Xbox console. If that is no longer true, I fail to see it happening.