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I guess I could be OK with an Edison dollar, or a Tesla Twenty, but where does one draw the line? A Soros C-note?

Nah, Ben Franklin would go perfectly with Edison and Tesla on scientific merit alone. Also keep Lincoln as the only US President to have a granted patent in his own name. Thinking about others makes me consider John Moses Browning for the $10 note. What think ye?

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No. Lincoln was the wedge that started it all. No presidents living or dead on any US coins or currency in 1908, barely 55 years later every circulating coin has a president:

1909 Lincoln 1¢
1932 Washington 25¢
1938 Jefferson 5¢
1946 Roosevelt 10¢
1964 Kennedy 50¢

The Kennedy half was being struck within TWO MONTHS of his death.

We are already perilously close to honoring living kings presidents on our money.

Let's fully reset to allegorical figures.

Before "In God We Trust" is removed from our money to be replaced by, say, Obama's ugly mug.

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I didn’t include the Eisenhower dollar because I can’t recall a single instance of it being used to purchase anything outside of a chance in gaming.

In any event, it would only bump the timeline out to a whopping 62 years, less than one aversge human’s life expectancy.