Right, that's a good example: it's the most mainstream of variants, gets support from FIDE and rich sponsors and world champions, and improves on perhaps the biggest complaint people have about chess - and it still only attracts a few percent of the audience and the participation of the standard game.
Fischer random chess is interesting because some starting configurations give a pretty big advantage to white (more than a half pawn advantage) whereas other starting configurations give less of an advantage to white than standard chess.