Just to be clear, the D7000 is going to prove to be an amazing camera for the many users who buy it. However, there are some things that set a semi-pro body apart. For example, the semi-pro will have a full magnesium body, with really robust water and dust sealing. It will also have a wide range of selectable functions that do not need a dial selector, but rather have push-button selectors. They also are likely to have CF card storage with its wider 16 bit data-bus. The semi-pro will also have "almost-pro" features like a maximum frames-per-second rate that is greater than a consumer model.
Nikon also offers a superior service turnaround for semi-pro bodies (in the UK, anyway). When I last took my D200 to Nikon UK they turned it round while I waited, but my son's D40 had to be left there for 48 hours - the reason was given that semi-pro bodies receive a superior service.
Looking at the D7000, it has some amazing features, like a 100% viewfinder and 16.2MP CMOS sensor! But if the D7000 is offering this level of features, the impending D400 (or whatever it will be called) is likely to have an even more amazing specification.
Put it all together and that's why I feel the D7000 is not a semi-pro replacement. It's an amazing body, but it's not the natural replacement for the D200/D300. Nikon is almost certainly keeping that distinction for the forthcoming D400.
Steve (Bedfordshire, England) My Nikonians Gallery- please visit and leave a comment A Nikon in the hand is worth two in the bag!