i cant see how there would be a measurable advantage to this, other than in $ and bragging rights.

when ceramics come down in price to, say,3 or4 times the cost of regular steel bearings, then it would almost make sence. It is to minisclule of an improvement for the cost imo. but ymmv.
I wouldnt discount them completely because of the wow factor. I would love to have bearings that smooth. the one draw back I see is that they are (ceramics) so delicate.