I don't think Canon wants to "save the consumer money"
Seriously, IS/VR began in the old days of film (it was sorta hard to stabilize the film), so stabilizing the optics was pretty much the only answer. It would be nice if Canikon added stabilized sensors, but I don't think it's going to happen.
Here's a c&p of some stuff I wrote on a Canon forum about sensor-based IS vs. lens based -
I used to shoot Pentax, and it was great having a stabilized sensor, because my fast primes (50mm f/1.4 and 35mm f/2) were stabilized. I personally had great luck out to 300mm, but folks on pentaxforums.com seemed to have good luck shooting the Bigma at 500mm at slow shutter speeds handheld, so I would say that body-IS seems to work pretty well at long focal lengths. Also, once Tamron and Sigma release their 70-200mm for Pentax, you'd be able to buy a 70-200mm f/2.8 "IS" for $699 instead of $1699!
HOWEVER, having a stabilized viewfinder with a big heavy lens like the 100-400 is a GREAT advantage to lens-based IS, as once I turn IS off, the view @400mm through the viewfinder shakes like crazy! (maybe I just need to cut back on the coffee )
IS on the camera body? - Page 2 - Canon Digital Photography Forums