How are the masses supposed to keep them in line if they're too stupid to make adequate decisions? If it worked like you claim it does, then the Vangaurd Party would just be an instrument of the popular will, bowing to the wrath of the ill-informed masses.

So.. hierarchy based on perceived intelligence by whoever happens to have the power of physical force to take over? That doesn't sound particularly helpful for developing a sustainable society or one that isn't based on coercion. I'm also not sure how this perspective fits with the withering away of the state.

What you're describing is setting up a revolving door for anyone with the might to enforce their will while assuming that everything will work out in your favor. Manipulating people into attacking your enemies for you so that you can retain totalitarian control and alienate the people from their labor, their autonomy, and their society isn't really the same thing as freeing then from oppressive and wasteful social systems.

There's also a moral component that's being left out here, namely that humans ought to have the right to make decisions for themselves. Whether those decisions are good or bad, they should be able to make choices in their lives and work together to make choices at a larger scale when it's necessary. They shouldn't be dictated to by a political party any more than they should be by capitalists.

This is also a practical matter. What incentive for people to educate themselves is improved by rendering their input into their societies meaningless?