Ad I said yesterday when this was posted. They tried this about 15 years ago, reverted to Windows after a few years.
I wish them all the luck in the world with this, truly. But I'm not sure a government has the drive, management, and flexibility to pull this off successfully.
If we want to see Linux compete with Windows for the desktop, it will need to start at the opposite end of the spectrum: small environments where the need for specialized apps is minimal, IT is a smaller group, flexibility is much higher, end users are a smaller group (from a training perspective) and reduced cost realizations are more apparent and impactful.
We may be seeing the beginning of this with VMWare's new, exorbitant licensing costs causing a push to other solutions such as Proxmox/TrueNAS for virtualization/virtualization backup in the SMB.
And if we really want to see a sea change, we need to get Linux as a desktop in education. But that would require settling on a single shell, and generally a single distribution (or at a minimum ensure there's a consistent set of tools in the OS).
Seems like an "Education Build" would be a great idea. But, again, who's going to back it, and which Linux distro gets the nod?