A logo evolves in the same way that a company evolves, Satoshi is an excellent engineer and a great visionary but I don't think he's a good designer.
the current logo that you commonly see as bitcoin logo is not designed by Satoshi, the idea is from his original design and idea but it has changed. if you think it is bad then feel free to give a suggestion or if you can design one, if it is good enough then we will use that as the logo.
edit: the original design was not even a single "B" it was a "BC" according to this picture:
(you can see the logo on top left corner)
Thanks for sharing this, it is interesting to see early versions of Bitcoin software. I seriously don't think the logo needs to change as it denotes value. All currency symbols look like this to denote value.