As much as there are games given an MA15+ rating when they need an R18+, there are games that are given an MA15+ and are suitable for that rating. Just glancing at what I have in view, there are at least 7 MA15+ games that would be inappropriately light in an R18+ category and inappropriately strong in the M category. Abolishing MA15+ would make a mockery of one or the other, maybe even both. The wrong messages would still be sent with regards to what is and is not suitable for certain ages. Primarily, the MA15+ category is wrong is when, thanks to people like his predecessor, games that should be rated R18+ are made available for 15 year olds.
Unless, John Rau, you're trying to tell me that games like Uncharted are actually highly inappropriate for 15 year olds. If that's the case, I think Labor has enough image issues without you adding to it with your silliness.