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But as far as the claim here goes:

"Bundles allow folks who opt into bundles to have others serve their content...again...on an opt-in basis. "

All so clever to say, but fails once sites decide you can ONLY access their sites through bundles. Sure you'll have an option, the option to accept the bundle, or not get access to the site at all (although the second option would probably be the wisest anyway).

And besides, if a particular page is bundled, then going to another page on the same site means you'd be re-downloading ALL the images and style-sheets all over again. So you're wasting a LOT more bandwidth, even if you ignore the malevolent nature of the spec.