I agree, the idea is more important than the creator itself. However, people will always want to know who did it, and it's also not completely irrelevant. Satoshi holds ~1 million Bitcoins and that gives him a lot of power about the future of Bitcoin. There's a risk if one man (or group) has the potential to destroy his own creation, or can control a major global currency (in case Bitcoin goes to the moon).
Sure, but difference would it make if we find out his real name is Jonathan Dough, or Neil O'Connor, or Salomon Fitzgerald?
Not the name itself is relevant but the person behind that name and what they stand for. I would think different of Bitcoin if it is created by some government organization, or a multi-national corporation, or Nick Szabo or whomever.
I like to know the agenda of the person who might one day own 5% of a major global currency.
Humans are curious by nature, so the search for the real person behind Satoshi will anyway never end.