I would absolutely love to change our motto back to
E Pluribus Unum.
In God we Trust has always seemed to exclude large swaths of the population, in my opinion. A motto that somewhat resembles our nation's ideals would be swell.
For context, I am the one person I know of at my school who says the pledge of allegiance in the pre-red-scare fashion, without waiting for everyone else to say 'under god'. (SEGUE!) It's not that I hate them for having a god, but constantly being singled out and occasionally yelled at for not saying the pledge 'correctly' has made me a bit frustrated. I'm downright tired of Christian phrases and standards getting up in my business, and I think that it would be better for everyone if we had a motto that represented everyone equally.
If I were a conservative strategist it would be no effort whatsoever to coin something about "We're in the middle of a deficit and the Left wants to put us further into debt to take the only thing keeping our money afloat off of our money!" Almost a turkey shoot right there.
Note that the petition doesn't say anything to the effect of, "Burn all our current money and replace everything
IMMEDIATELY!". I imagine that as the federal mints print out new money and worn out bills are shredded (they do that every year.) the newer money will seep in. Just like when they added all the new colors to dollar bills: you can still use older money as legal tender. It would be almost as simple as changing the printers' programming. An undertaking of reasonable size, but nothing that would murder the economy or really even expand our debts.
Beyond that, you could cite the founding fathers back at the right-wing folk, their pundits tend to go into conniptions when that happens. (Make no law respecting the establishment of a religion, The Morals and Teachings of Jesus of Nazareth, etc.) Not even mentioning Republican golden boy (of a bygone era) Abraham Lincoln, who said that a house divided cannot stand. Wouldn't everyone feel better about our money, and be more confident in spending it? Or some other strange punditese.