[Dalewyn]

Windows 10 will meet EOL in 2025, which coincides with the ceasing of publishing printer drivers to Windows Update. Anything beyond that likely won't apply since Windows 10 past 2025 will either be out of support or only getting security updates.

The key point here is that Microsoft will refuse to WHQL-sign or publish third-party printer drivers from 2027 onwards.

Third-party drivers, without WHQL-signing, will continue to be installable past 2027 on the provided timeline if the manufacturer provides them.

[DaiPlusPlus]

Presumably there exists (or will exist?) a WHQL-signed minidriver that passes any processing step to a userland process?

It is only for resource-constrained machines of the early-1990s that printer-drivers needed any kind of kernel-level access to a system; with IPP and modern USB stacks no-longer needing any kind of kernel module, I'm not seeing how this should be a problem for anyone except domestic spy agencies losing the ability to suppeptiously intercept every printed document.