I imagine if Microsoft can't get you to upgrade to Windows 11, they will make a few out of support updates to Windows 10 that will annoy and nag, plead, beg, and maybe even use UI tricks to have people "accept" an upgrade. If that doesn't work, they may even incorporate the worst of Windows 11 through some side channel like Internet Explorer.

For when Windows 7 support ended they started filling the OS with updates and UI elements for the purpose upgrading, and lots of people ended up accidentally upgrading to Windows 10.