We need more Red Hat and less Microsoft in the on-prem enterprise business. These exploitable vulnerabilities are unacceptable when your customers are the likes of DoD. No one considers Google anything less than an impenetrable fortress, but when it's some government entity responsible for keeping American lives safe it's like "ah yeah they probably have a vulnerable on-prem Sharepoint that could easily be pwned." So…
But, for enterprises, the only reasonable migration away from Windows is Mac. JAMF Pro for Mac can be hosted on-premise on Linux. The majority of enterprise software runs on Mac. However, Macs are expensive so it's unlikely to overtake Windows enterprise machine usage.
Hardware support for Linux PCs is poor and lacks the manageable of Windows PCs with Active Directory and GPO, or JAMF for Macs. Enterprise software usually doesn't support Linux. Linux PCs are uncommon for personal use and corporations don't want to train users how to use Linux.