I would be completely satisfied if:
Nintendo released a USB flash drive that allowed the internal memory to be expanded to the drive, so games could be loaded and save directly to the flash drive, so I can take my saves to friends' Wii without having to shuffle the saved games around. Since they already lock down the VC games to your console, it would be great if you could also load directly from that same drive. I can assure you that it is a simple fix in the Wii OS - a 2 GB stick compared to 512 fixed internal sounds so appealing. The same could be applied for the SD slot.