The potential problem in future with Rally2 is that it is based on homologation in GpA. If manufacturers lose interest in going through the homologation process then you don't have a base car to work with. Once you've got that base car you need to fabricate most of a space frame inside it to provide rollover protection and bodyshell strengthening. Moving to a space frame formula might give more opportunities for more developers outside of the manufacturers to produce Rally2 cars. It all depends on how the regulations are drafted and how the base car is selected and prepared.