Well said yourself . . . and it NEVER ends. We're all doomed.
During the 35mm film days, we often used the same camera body for many, many years before moving up. Even then, purchase of top quality glass outlived many bodies. I've owned and used my 80-200 for at least two decades. It's been serviced three times by Nikon over the years and remains as sharp as ever. I've got a lot of glass like that and so do many others. You too I guess?
My father-in-law has been using the same, heavy pig of a Manfrotto tripod for more than twenty years. He's an excellent photographer. He used an MGR/MGCR(?) series Manfrotto head for a very long time and only recently upgraded to a Kirk ballhead. Meanwhile, I've gone through five tripods (at least) and countless heads during the same time period. Dopey me - and my photography only improved as my eye improved. Nothing to do with the stupid tripods and heads.
FX in low light/high ISO situations is a revelation. My D3 opened up photo ops I'd been looking trying to get for years. The D700 which I just picked up makes it easier for me to do much of what the D3 does but with a much lighter load on long urban walkabouts.
Anyway, my point is that after 10 megapixels, top quality DX and full frame 35mm-equivalent photography has more to do with composition and lighting than anything else. I think we've reached the point where megapixels are simply not the deciding quality factor anymore.