The problem with hybrids is that it's a technology non-suitable for use by privateers. It's too complicated and it must be extremely costly for private teams. In rallying they also have to work in very rough conditions so I'm a bit afraid of safety. Especially of spectators who push cars back on the road after crashes. That's something not present on circuits. Circuit cars have warning lights showing when marshals/mechanics must not touch them but such warning can not work with a crowd of partly drunk ordinary people.