Though I agree that IS (either in-body or in-lens) is a great boon to hand-held photography, I somewhat agree with Doug that the need for stabilization (be it IBIS, ILIS, monopod, tripod ...) for high pixel counts is somewhat exaggerated. As a rule of thumb, "1/f" is about right for 6MP, or as I call it, "3K" (3000x2000) and 100MP is about 12K, four times the linear resolution and so needing about four times the shutter speed. Going from ISO 50 film to ISO 200 on a sensor would be enough!
Also, I can see a use for getting 100MP sometimes (tripod, flash, good light, elevated ISO needed to freeze subject motion anyway, etc.), but "settling for a mere 50MP worth" in some hand-held situations.