Beforde deciding which gens and formats should be played in the tour you need to decide fundamentally what this tour is.
If you drop ORAS it can't be called RoAPL, it would be ClassicsPL or something in that regard.
If you are strict with the word RoAPL it would include SM and SS aswell. Not including those, because they are well represented in other tours, including smogtours is a somewhat valid point.
The question of the ORAS representation is a bit difficult, because it is borderline. It being in OUPL, but only with one slot is kind of an weak argument, it being in WCOP a better one. Not having ORAS because its in Masters, when there is Classics as the counterpart is nonsense though.
In my oppinion you can't have it both ways. This being RoAPL and not including at least ORAS.
The fundamental decision that needs to me made is: what is this tour?
Either make it:
1. ClassicsPL - but then make MastersPL aswell
2. Keep it the way it is.
3. Add SM and SS and find a solution to reduce the amount starting spots per team (for e.g. 1 spot per Gen, but add a Classics bo5 or bo3, extra rotating Classics gen each week, Masters bo3, etc.)