Well, after spending half an hour on the phone with two different poorly trained Nintendo customer service reps, and after explaining 500 times over and over to each of them that No, I'm not still trying to play VC games on my old system and that the actual problem is that I can't launch VC games from my SD card after transferring to my Wii U, they finally decided to open a trouble ticket with a supervisor who will hopefully get back to me tomorrow.
That's pretty much their code for "I'm hanging up now. Bye." I'd be shocked if you got a call tomorrow.