Exactly. The Fight is a good example. Last time Sony demoed it, the lag was noticeable. Apparently the demo at Gamescom has made the lag negligible to the point of not being an issue. I'm sure the pointing tech (for games like Socom) can similarly be optimized so that response times aren't an issue. We're seeing similar work happening for Kinect as the launch approaches.
What this means is that we're still in the early days of knowing how to handle motion tech. Even after a few years of Wii games being made, devs are still working out the kinks and getting their bearings. I'm approaching these new motion techs as "test runs" for next generation. There might be some cool stuff, but a lot of the lag and accuracy issues won't be worked out completely until the next go around.