This is not a new idea, but I buy 12 new decks and open all of them. Then I deal each deck of cards onto the table face-up, face-down, face-up, face-down, and so on. And then I place the entire deck (including jokers, advertising cards) back in the case.
When it's time for a new deck, the cards are usually perfectly flat or unwarped. I've heard that some people place the cards in the refrigerator to hasten the process, but I've never tried it. After the decks are "cured", I remove the jokers and advertising cards and perform table faros and riffle shuffles to break in the cards.