It's my opinion that we are hesitant to make this move because the of the mental image between the US dollar bill and the strength of the nation. Politics, markets, economies aside a "greenback" is a symbol of the US as much as any monument or famous President. By making it pocket change you have marginalized the perceived strength of the US that a dollar represents in the minds of the Americans who use it.

Here was mine: me: So, how are you today? CB: I'm good. How are you? me: Fine. What do you think about your recent win in the AI contest? CB: My car I like it. Its a slug bug.

I recall Leonardo and Donatello having the same strength of attack, but on the big sweeping jump attack Donatello had that little extra reach. All a long winded way of saying "I too voted for Donatello because of his video game stats."