I can see the reasoning behind it but no one is going to completely do-away with a desktop AV just because the have one on their router/firewall (expect for you dino ). It may protect against threats from the Internet but if anything gets past it, or is introduced to the network internally, then a desktop AV would still be needed to offer any form of protection. So I can't completley see the point of it.

For the price of a years subscription though (I think the article said $60 per year) I can see a fair amount of companies making use of it - SOHO style ones probably.

Would be interesting to see the overhead that the software puts on the router and if it affects routing speed etc.