The engine size, state of tune and bike specification should be the same maximum for all and if some choose to run a twin or a triple then that is their choice. If the rules are rigged to suit a particular manufacturer then the optimum machine will never emerge and machine development is artificially stiffled.
It is clear that twins have an advantage in the way they put the power down and rideability whereas the fours seem to have the advantage in power. Altering the firing order and modifying the torque curves has helped the fours develop a better way of laying down the power and this has been reflected in recent developments with road bikes. Motor GP is tending to indicate that V4 configuration may be the optimum, rather like Formula 1 showed the superiority of V10s until all teams were restricted to V8s. If the major race series for road based bikes is skewed to favour a particular manufacturer, bike development is bound to be restricted and channeled in one direction. This may be seen as a plus for Italian bike fans and Ducati but it is not good for the development of bikes overall.
The racing might be exciting to watch at the moment but I can't help feeling disappointed that Superbike racing has allowed itself to be manipulated by the Italians again just as Ferrari manipulate Formula 1. A race series in which everyone knows which make of bike is going to win before it begins will inevitably become boring, we might as well call it the Ducati SuperBike series
Mike