Really ? Do you think that malware is on Windows because it is the buggiest OS ? What would happen if everyone suddenly started using Linux as their main desktop ? ( besides a huge shit storm )
That being said , I agree that AVs were a burden on computer resources ( not really now when you have 10+ cores ) , but there's no amount of "secure" code that will prevent user idiocy. Also, most people would not like a dictatorial OS that restricts you in every way possible "just for your own good"