end users could accidentaly install Windows 10.
This is exactly what Microsoft is counting on ... that millions of Windows 7 & 8 users (who are not computer savvy) will just accidentally allow the Windows 10 installation process to complete (not realizing they have a choice to not install Windows 10).
Regardless of what settings one has for Windows Update, every Windows 7 & 8 user, who does not want to install Windows 10, must be diligent whenever running Windows Update.
Microsoft will continue to escalate their tactics for coercing customers to upgrade to Windows 10.