Actually, it's quite the opposite. Multiboxing is in fact easier to spot. And if anything, the "deader" a server is, the more likely the people on it are multiboxing.
My point was that people I know aren't multiboxers. There are enough of them that you can see them, but just because you see them doesn't mean they represent the majority. Whether it's Asura or any other server, multiboxers are a minority. It just seems like there's more of them than there are because of the fact that one person is controlling several characters.
Shiva is far from "dead." It's just not overpopulated like Asura is.