First off, I do not believe the SCOTUS will uphold the 9th Circuit decision since the recitation of the pledge is already voluntary per an earlier SCOTUS decision.
Next, if the (inserted) phrase "under God" is struck down, we'll need to clean-up the money & many of the original docs in the National Archives.
"Whaaa!? Not the original docs" you say?
Sure, afterall the founders made changes themselves ("ownership of land" changed to "pursuit of happiness").
And remember, revisionist history is all the rage.
http://www.msnbc.com/news/980091.asp?0cv=CA01