Comment on WordPress SEO by Rachel.

WordPress SEO The left sidebar is key for navigation purposes (categories) and for putting some ad units (160×600) down/up the scroll – That’s one of the reasons I still work with Talian.

For me, having the main content higher up the source code is an important factor. SO, I’d give up making changes that could harm that order.

Still struggling with my Talian to achieve it. Might be hopeless? :-)

Yes, I see why the archive pages are going to be affected as it is a sidewide change.
But, this proposed layout could be good option for a new them, or even series of SEO themes.