Do you think President Obama will have his face imprinted on currency?

If so, what will his value be? I know, it's still too early to judge him but a lot of people don't understand the significance of him being the first African American president. Considering history and all the doors his election has opened. (All we need now is a female president, but I don't think that will happen until another decade or so.) By the way, a lot of white Presidents weren't exactly saints. I know for a fact, some have had slaves. Some have even violated the Geneva Convention, e.g. Bush 43. Some have done despicable things, e.g. Nixon with Watergate. Anyways, when and under what cirstances do Presidents have their face imprinted on currency? Is there a set time frame? Such as how a person has to wait so many years to be inducted into the Rock and Roll Hall of Fame? Or, something deemed culturally significant is preserved by the National Recording Registry or National Film Registry? *-FYI- I'm like Obama, my father is black and my mother is white.* Just in case you are wondering by my avatar.