Until a targeted attack turns every computer into a zombie DDoS farm inside an air-gapped network (thus, by definition not really a targeted attack anymore), AV

Until a targeted attack turns every computer into a zombie DDoS farm inside an air-gapped network (thus, by definition not really a targeted attack anymore), AV companies and Mom and Pop shouldn't need to worry about these kinds of things. Stuxnet can be installed on your mom's PC and it'll provide just as much system instability and maliciousness as Winamp or uTorrent. The real threats to moms and pops buying off the shelf AV products from their local BestBuy are the threats that are targeted at your mom and dad to steal their passwords, bank accounts, and include a trickle of Spam into the torrent of daily inbox junk that gets sent out every minute. If a nationstate decides to buy Norton 360 (et. al) to protect their nuclear reactor PLCs from being fucked with by another nationstate, well, they're screwed. There is no solution at that level (yet).