Theres a heck of a difference between someone working in a corporate environment, and the average home user. And those "average joes with two left hands" are the problem.
They have not got a clue what "safe browsing" means. Yo have to lock their machines down to protect them from themselves. Of those plugins, the only ones that require manual updates are Spybot and Spyware Blaster. The only one which requires user input is NoScript - something easily learnt by most
The rest are invisible to the user.
I judge how successful things are by how often I get called back to sanitise machines I've previously worked on. The fact is, what I do works: I never need to reprise the protection on machines I've worked on.