Heh! It's all a matter of perspective!
It's funny how perspectives to change as technology moves ahead!
Why, I remember back "in the day" when I enthusiastically collected "vinyl" record albums, and lovingly played them over and over until they all had that distinctive "scratchy" sound...
Then, all of a sudden, CDs were "born" and very quickly I jumped on the new "format". CDs could be played without damaging them, no more "scratchy" sound, and my vinyl album collection was no more!
And then, we could "rip" our CDs onto a computer, listen to Play Lists, put them on MP3 players, whatever, and guess what? My CD collection sits in a big box!
And, don't get me started on the old VHS tapes that I again collected enthusiastically, until the DVD format made its entry. I was sold on DVDs before I even picked up my first player!
So, with digital cameras, well, it boils down to the fact that if folks figure the higher resolution bodies are "value added" and if they can afford the upgrade, well, their perspecitive has been changed with the introduction of the new technology, sure.
However, there are many of us for whom the new technology is not "needed", wanted, have-to-have, and especially affordable. If someone gave me the latest and greatest body to hit the streets, sure I'd work it! But I'm not the kind of shooter who "must have the latest", and besides my "gear acquisition" days ended, well, several years ago.
That being said, "croppability" is not a bad thing. In fact, when I'm shooting various things, maybe small, maybe distant, sure, I want to take a high-quality shot that I can then crop to get a good composition.
But for much of my shooting I aim to properly compose in the camera with an appropriate focal length. So, aside for a bit of cropping and maybe "straightening" the one advantage of having a higher resolution is to print larger prints while retaining "pristine" high detail. But of course, that requires not only a lot of megapixels but also a technique that will yield the pristine results!