A PDF file with the corrected cards is fine. If you could do print on demand cards that exactly match the originals, I would pay for them. However, since I don't sleeve my cards I don't want mis-sized cards in the mix.
Something I'm not sure I saw mentioned - Would the print on demand cards include corrections for the yet unreleased adventure decks 2-6? Or only the base set + adventure deck 1 and character add-on pack? If I were interested in buying the print on demand cards I would be worried future card corrections would come up and I'd have to pay for them again.