Based on my experiences, the D700 isn't actually doing that well. A lot of my colleagues (those who shoot Nikon anyway) are going straight for the D3 over the D700, and picking up a D300/200 for their backup camera. The D3 doesn't cost *that* much more than the D700, but is a better package. When I'm out on shoots, I see very very few D700s around (much like the D3x, of which I've seen one outside of a studio) - if they were a run away success then I should be seeing a lot more of them.
Different markets act differently, in the US- probably still the single-biggest DSLR market, the D700 is definitely outselling the D3- though I'd bet Nikon would actually prefer it the other way around as the D3 is a slightly higher-margin body. I'll bet that Nikon's annual statement next year, or even the quarterly statement the third quarter of CY09 is going to single out D700 sales as above predictions.
The rumoured D700x is going to add video and possibly a higher resolution sensor (although that goes against your statement that Nikon only issue "small" updates when they append a letter).
Again, reading comprehension 's' updates are small, 'x' updates are resolution + features. Once again there's a long history of such updates, so it shouldn't be a mystery or surprising for anyone following the market.
The problem is, putting a bigger sensor on the camera will kill D3x and possibly D3 sales much like the 5DII has impacted seriously on 1DsIII sales (I most commonly see a 1DII/III paired with a 5D these days rather than a 1D/1Ds combo). Throw in the fact that Nikon will possibly keep the D700 around, the RRP on the D700x is going to be even more expensive - UK price I'd imagine around the £2200-£2500 mark which is directly comparable to a 5DII.
Another fundamental misunderstanding of the market- Nikon have done the math, they understand the volume and unit price comparisons as well as the impact on higher end sales- they're perfectly happy to eclipse a model with a newer, lower-end model (such as the D300 eclipsing the D2x) when the time is right. The business strategy is to get the most profit (high margins) on new release when the sales volumes are lower and you're ROIing your production line, then reuse the components for the higher end system, or add new components as the technology allows and sell a higher-volume lower-priced camera.
Again, Nikon's camera division made a profit last year- Canon's didn't. Nikon's profits were mostly based on DSLR and lens says (though they outsold their predictions on Coolpix by a good margin P&S margins suck generally.)
I don't understand what your bone to pick with Nikon is Peskka, but it's funny, I will acknowledge that!
I think the existing Nikkor 70-200 is at least as good as the current Canon offering.
Better sharpness in the center, worse out from there- it's pretty-much a wash IMO.