The same thing crossed my mind as I read the various Kepler stories in the press right now. Apparently that technology isn't ready for prime time. Remember that these components must tolerate very high vibration and temperature extremes to qualify for spacecraft use. Most permanent magnets lose their field if raised above a certain temperature (Curie temperature) and many of them aren't very tolerant of vibration.

In any case, for various reasons, frictionless bearings aren't ready for spacecraft use.