Not necessarily. Most cages have capacities of 5 quarts or less with engine displacements of 3-4-5-6,000 cc. Our Spyders at 4 quarts are actually large compared to the displacement of 1,000 cc. Cages do have larger filters. I think the overriding thing is autos burn so clean that the nasty byproducts of combustion are just not there to get into the oil and contaminate it. They are also turning much lower rpm and just "not working as hard".
Or look at 1800cc Gold Wings. Since the 2001 GL1800 model came out, they have 8,000-mile oil change intervals, not even specifying synthetic just regular motorcycle oil. They hold 4 quarts of oil. Their average cruising rpm is probably about half of the Spyder's so on a revolution per mile basis maybe it all works out. And that thinking could apply to the new RT's as well. If their cruising rpm is much lower than before, that's fewer engine revolutions per mile.