I actually hadn't heard of this until right now....I wasn't sure if you were being hypothetical about it, but I typed some stuff in google and found that there have been calls for this stuff....the one I found was changing the name of a school due to Thomas Jefferson owning slaves.
I don't think they'd rewrite history books though, because I don't think anyone has hid that he owned slaves....it was pretty much out there, so they couldn't really change the books on that. (However, Jefferson was apparently romantically involved with one of his slaves, and that she might have given birth to illegitimate kids).
Do I think they should change names and currency, and anything referencing him? No.....He owned slaves, which was considered the norm during the time period. While we know that the slave trade was absolutely horrible, to them, this was perfectly fine. However, you CAN ding him for being hypocritical, as he wrote the declaration of independance, which obviously only applied to white people, as he owned the slaves. All you can do is just not paint him as being some sort of hero for rights, because he had no problems with being a high rank in the class system.
However.....saying that he needed the slaves in order to do what he did is a bit....er...odd. He didn't need the slaves in order to do anything, rather, he had the slaves because of his status. Due to that status, he was able to become president.