It sums it up for me too. I think us D300s users are in a particularly tough spot decision-wise. Our cameras aren't that old, and the D300s is built to last many years. I just got mine as a surprise gift from my wife in late 2009. But now I can't help but feel a little envious and left out when I see most every other camera on the market with more pixels and hear about the better image quality in the noise and D/R department. I know my D300s takes as good as pictures now as when I got it, but that doesn't make me feel any better. And I have to admit feeling just a little guilty knowing how proud my wife was, and me too, when she got me the D300s just 3 years ago.
What compounds the problem for me is not knowing how committed Nikon even is with the DX format for its higher end cameras. For example,I need a new wide angle zoom but don't want to spend $500-$900 on one if the D300s and even the D7000 are the end of the line for DX except for the entry level models.
I would consider moving "up" to FX with the D600, but it doesn't offer bracketing like I get with my D300s, which I need for my HDR photos - well, don't absolutely need, but it makes it a lot easier to bracket 5 shots plus and under 2 stops. I could live with the slightly lower quality body construction and maybe it doesn't even make good sense to buy more camera body than you really need given how fast they become outdated. I'm also giving thought to the D800, but that would set me back a good $6000-$7000 by the time I buy the camera, L bracket, cards, and a couple decent lenses. It also doesn't seem like the sort of camera I would want to take anywhere, and I like just shooting with one DSLR. Digital is complicated enough the way it is. For a one camera solution in FX, I feel the D600 is a better choice.
Then with FX there is the cost of the lenses, which I feel is DX's number one advantage. For a wide angle zoom I would need to shell out at least $1300 for the 16-35, while with DX there are much cheaper options. Not to mention the additional size and weight.
Too many decisions, but I guess in the meantime I need to continue getting the most out of my D300s and maybe not worry so much what is avaiable now, what others are shooting, or what may be available in the future. Surely, within the next 6 months the future of DX will become clearer one way or the other. I don't see Nikon being foolish enough to try to force its serious DX shooters to FX by limiting our DX options.