If you are talking about built-in Defender being the tipping point to compel you to move to Windows 8 from Windows 7...
That is a non-reason, reason. MSE is 100% free and the same damn thing. The phishing filters and other BS is part of IE, which is also present in Windows 7, not Windows 8 specific. The ASLR, et al are in both versions.
There is really nothing tangible which compels an informed PC user to 'upgrade' to Windows 8 from Windows 7.
My conclusion does not stem from articles. It comes from actually using it next to 7, doing the same user and admin tasks I usually do. Without third party software to reign-in Metro it dominates and cripples the experience for a PC use case.
The ONLY thing I wish 7 could steal from 8 is the task manager...
It use it in a Parallels VM but it takes little time to become adjusted to using 8.1