While I still love the idea of a (truly) global menu, I've come to the point where I think it's a flawed concept unfit for the big screen.
For instance imagine the settings section. You'll need three columns there, effectively covering half the screen, which probably still allows you to fit in all the options but it's going to look cramped. Another downside is that a screen full of navigational content is confusing and makes it kinda hard to focus on the task at hand.
And even in not as deeply nested sections you're bound to use a lot of space for navigation which otherwise could display content, the heart of XBMC / Kodi.
My biggest issue with global menus however is that they don't save you any clicks. Pressing 'back' is just as fast as hitting 'left'. Their only use appears to be to give you some sense of context. But bread crumbs are just as good for this, and one might even argue about the need for those.
Actually, thinking about it, you might slide columns in and out of view to alleviate the settings section issue. Kinda like what you're doing with the 'View Options'.
Despite all my concerns, I believe this could be a real nice skin for touchscreen devices and wish you all the best with it!