It's funny, because this is what Movable Type did, back in the day. James Hague echoed your sentiments in "Solving the Wrong Problem": http://prog21.dadgum.com/130.html
Blogger was like that too and I loved it. It's why I've had super basic shared hosting at Dreamhost for so long - it could handle pretty much any traffic by serving up plain HTML.
I'd be curious to see how a "Blogger of today" would fare if it also had Dropbox integration, so you could use specialized local apps like IA Writer if you wanted to but also still write or edit on the go without your main machine.
