The always thoughtful John Harris has a piece in today's 'Guardian' on how the adoption of primaries will only mean the further advance of plutocracy. It's hard to disagree with him.
Like proportional representation, which is nothing but gang warfare perpetrated by the parties on the public, primaries sound like a great idea; but they only exist to find the most electable candidate for the party, not the best candidate to serve the people.
Take the parties out of the equation, and they become redundant. They are just another mechanism by which the parties can keep going on life-support.