Alot of what you guys said is true and it seems as though there are many reasons why they should and why they should not scrap the 15 year old rule. I personally think that they should not scrap it...why? because I'm not made of money and I'd take an 89 R32 GTR over any brand new aussie built car of approx equal value....but thats where the problem lies...
Those car enthusianists or those who want some power in their car know that the technology in these 15 year old cars, is far more superior than SOME locally made cars and so your average joe blow is gonna want to get the best value for his money....therefore he buys an import and the aussie car market suffers.
15 year old cars are a cause for concern as things such as rust and bad engine emissions can start to kick in but does the government really think that a 15 year aussie made car is gonna be safer/cleaner than a japanese one? Of course they don't!!
Introducing the 30 year old rule greatly increases the chances of bringing in crap but the government knows that the import volume will be lower as the mentality is "how many ppl want a 30 year old car" and if they do, they are the "real enthusiasts."
I agree with the guys who said to set limits on the number of 15 year olds that can be brought in to protect the local market and have inspections to ensure they're safe, but don't rid your average middle class guy, who is not made of money, from having one of a series of legendary cars today, just because he can't afford one of the later models.