Who will be CEO is not so relevant in my opinion.
The Board (proxy for the big shareholders) sees that the company is not valued enough at Wallstreet. A revenue of 14.x bn $ is represented by a company value of 4.x bn $.
The idea was since the creation of DXC to get a higher value by spinnig off parts, selling the whole or split the company. This has only worked out in small details.
Two Mikes have failled to execute against the plan.
The Atos offer of 10bn included some 5-6 bn of debt, so there was to less in for the current shareholders. This offer was only attractive for Mike2 (60 mio) as a bonus.
You can guess what the new CEO will be incentivised for, and what this might mean for employees.