Vault Citizen said:
Why can't they patch it? Can someone explain to me why DLC is possible but patching is not?
DLC is new content, delivered electronically. If the game is designed for it, it has hooks which allow DLC to be integrated into the game in a defined manner.
The track data is coming from a cartridge, and it's unlikely they built in any hooks to allow external programs to access that track data directly -- especially to make changes to it, because these are the exact sort of things that cheaters will use.
So that means a patch would somehow have to crack into the memory space of the game once it's loaded, and make alterations to the track. Cracking into used memory space is simply not something you want to be doing. Ideally, it's not even possible, so I can understand why Nintendo doesn't want to spend resources essentially proving there's a hole in their software security.
OT: I think they did the right thing. So long as they widely publicize the cheat information, it simply becomes the new track route, and doing it in such a way as to minimize your time taking it becomes part of the skill-set of that track.