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Well, If you don't take the part i agree with to be something which is to be instantaneously implemented, it could work
I mean, they're going to run out of artwork eventually, so they'll need to make/order new sets, so why not order some for previously existing villages?
Obviously this would be something that wouldn't come into play for a long time, I think they have quite a few villages saved up (I think enough for region 5, almost completly speculation though)
That would be possible, Karab, except for the fact they probably use the same scheme for all character-making. This is just a hypothesis of mine, but based on logic, because of the following:
If you notice, on each Village, there is a space on which you can see the characters you already unlocked and the ones you still need to unlock for that village. This feature uses a shared artwork on each village and, probably, the same coding scheme. Other things, such as Achievements and such also follow shared rules.
Thus, I don't think that they will ever need to order a new coding system. Artwork, yes, eventually they will run out of it and will need more. However, they'll probably do such BUT re-using the coding already present on the game.