Well but aren't the future Rally1 basically that? Rally2 with safety cell, a bit more powerful and a bit larger aero. So FIA can make a variant with less aero, less tuned engines, limited suspension or something and call it Rally2. Basically like an old LMP1/LMP2 situation.

To me it seems like future Rally1s are closer to today's Rally2 than Rally1, excluding the safety cell.