They don't want to change their AVs because it would cost money in R&D if they don't know how they would make it not intrusive and not access the kernel. They are being stubborn because they aren't getting their way, basically.
Like I said, if a hacker really wants to get into your machine, no matter what, he will. No system is completely fool proof, viruses can still get in where they aren't supposed to. But why help them by making vulnerable programs access the kernel constantly?