Interestingly, this is exactly what the guy at my local camera shop was pitching when I got my D300s. He told me he couldn't imagine why anyone would buy a D300s when they could order (and wait for) a D7000. He cited the higher resolution and video features.
I bought a D300s anyways, because I wanted the tougher chassis and implied longevity of the duty-cycle tested shutter.
And in my eventual upgrade deliberations, I decided a D700 was the upgrade from my D300s, and you already have one of those.