I suffer from Dyspraxia which is a sequencing issue. I KNOW that when things start getting full, I'll be confusing myself moving things left, right and centre, and that one day, I shall zip about trying to free up space to grab a new vc game, or save progress from a new wii game purchase, and delete the wrong thing. If this is a vc game - I'll be able to download it again, but deleting something like a Zelda save game will hurt.
This is a flawed system, and seems at odds with Nintendos efforts to make gaming easy and accessible to all. If my grandparents are supposed to want to pick up a wiimote and play golf or tennis, why make them jump through hoops with SD cards? I have enough faith in Nintendo to ultimately make it so we can save games to SD cards, but at this moment in time, if I'd known what I do now, I would have politely declined the offer of an additional SD card at point of purchase, and I suspect there are others here who would have done the same.
As did I....and I believe I already explained why you cannot, and will not be able to save VC information in any way other than natively.
There's probably some authentication issues with VC games to prevent people breaking the encryption and injecting their own code into a VC emu/game package on an SD card, so I'm not holding my breath on that one....