I rate Test football over Origin, and I would support the Kiwis joining NSW and Qld in the Origin arena- it could be a Tri series with all three teams playing eachother home and away, and the two sides contesting the final determined by points aggregate. The final would be played home and away, with the team (again) scoring the most points over both legs being deemed the Champions.
Origin is seen as the pinnacle because it is (generally) a much more even contest. Even though NSW have not won a series since 2005 (although hopefully that changes in the next few weeks ;-) ) there has only been one series since then where the Blues didn't manage to win at least one game. Even a look at the scores in those games reveals only a handful have been blowouts.
It is very small minded to claim that Origin is the worldwide pinnacle of Rugby League, but blame should also be levelled at the foreign teams for not raising the standard. If England could match (even beat) the Kangaroo teams more frequently, it would raise the passion and the intensity of Test football. Thankfully the Kiwis are starting to get their act together, but the reason many players (and fans) in Australia seemingly value Origin over Test football is because Origin is the closest, most nerve-racking encounter at this point in time. I do look forward to a time when Test football is at least on the same level. That's more a problem for NZ and GB to fix, and less of a problem the ARL can fix...