Replying to Carlton Gibson:
Hmmm. I'm a bit sceptical that very many people want to remove the header entirely, but I agree that a single block would make that feasible.
Even after doing the above the top-bar doesn't entirely disappear dude to the CSS applied on the <div> with the id of header
Query: an amount of CSS resolves that no?
Yes, adding CSS to make would surely make it disappear, but I'm not sure if that would be the best way to do it, but again, that's just what I think.
About the first point, I have come across many occasions when I needed to replace the admin top-nav and personally, I don't think its that uncommon to have a themed top-bar that you want to use throughout the website.
At the same time, I agree, it's not a pressing issue by any means.
I guess it's just a matter of deciding whether making something like this more convenient for the user justifies adding another block...