This article doesn't apply to home users, this article applies to companies.
Companies are still targeted by malicious viruses, trojans, worms, etc. that can cause extensive damages.
Unlike home users who appear to only get infected by rogueware now days that doesn't cause much damage.
Yes they need protection, however most of the free solutions are only for home users, so they will have to buy a solution.
In my area, most of the companies, business, government and military use either McAfee or FortiClient. Both provide excellent protection for companies and are much cheaper than other solutions. Companies should shop around to get the best deals that are cheaper and still provide excellent protection. Prices can be much different according to your area.
It's very much true if you properly train your employees it can cut down on infection, but people are people and make mistakes, therefore in a company environment a good antivirus is a must have if you want to protect your investment. Just one infection can shut down all computers in a business, cause lose profits, bad customer relations, lost data, etc.
Advanced protection like HIPS and sandboxing just doesn't work in a company, just one mistake could cost millions of dollars.
Just think of what the damage would be to your area, if your power plant computers got infected and went offline. It could be much worse if your power plant was fulled by nuclear reactors.
Thanks.