Why so little in body image stabilization?

I am willing to pay extra for stabilized lenses over an above a stabilized camera when those lenses have focal lengths above 100mm or so.  I'd love if Canon came out with in camera stabilization for my other lenses, like my 17-40L, 35/1.4L, and 85/1.8.  But they seem to be going through their lens lineup and redoing all their lenses with IS, so I don't think I'll get my wish.

Incidentally, Canon's strategy of tiny, incremental upgrades has prevented me from buying any new cameras from them since 2005 when I bought my 5D.  There are signs things are changing, with the f/8 AF upgrade to the 5DIII, the radio flashes and so on, but there are still signs of stupid behavior too, such as the removal of video crop, the lack of support for in-camera DNG, and the lack of in camera stabilization.  Until they do better, I'll continue to keep my 7-year-old cameras.

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Lee Jay
(see profile for equipment)