Taking a step back: The "Page" paradigm is still very much alive, despite these recent javascript parsing advances.
1. Google still needs a URL-addressable "PAGE" to which it can send Users.
2. This "PAGE" needs to be find-able via LINKS (javascript or HTML) and it needs to exist within a sensible hierarchy of a SITE.
3. This "PAGE" needs to have unique and significant content visible immediately to the user, and on a single topic, and it needs to be sufficiently different from other pages on the site so as not to be discarded as duplicate content.
1. Google still needs a URL-addressable "PAGE" to which it can send Users.
2. This "PAGE" needs to be find-able via LINKS (javascript or HTML) and it needs to exist within a sensible hierarchy of a SITE.
3. This "PAGE" needs to have unique and significant content visible immediately to the user, and on a single topic, and it needs to be sufficiently different from other pages on the site so as not to be discarded as duplicate content.