I'd love to see a Linux distro attempt to implement a migration wizard for Windows users. Do all the heavy lifting for them, including walking them through what personal data and accounts they want to migrate across, creating a bootable USB installer, then running said installer and copying across their data for them. Maybe even detect and install any apps they're using, or suggest FOSS alternatives. In practice I imagine this would be a nightmare to try and implement effectively, but it'd be pretty cool to see.