Why so little in body image stabilization?

nikkorwatcher wrote:

Having used both, I think the delay in optical stabilisation working could prove a distraction. According to wikipedia it came along in 1994 with film cameras. The reason they carry on with it is that "Not Invented Here" syndrome that sensor stabilisation provokes. Canon & Nikon have a system that works and offers an overt advantage of working in the viewfinder (spurious or no) and they can obtain a per-lens profit on their own technology. So far on dpreview I don't see anyone already on their camera systems that sees the need to switch systems on the basis of optical v sensor stabilisation, so the big two have no motive to change their designs.