I believe if you buy from someone other than DVC directly (i.e. The Timeshare Store) it stays as the date of the original buyer. Someone correct me if I'm wrong though.
However, all of my TTS purchases received new cards 2-3 years later with the corrected date. I never requested them, they just started showing up. Also, I got 2 of each card, even though I am the only user on the contracts. That may be due to the fact all of my memberships are corporate owned.