Yes, most polls on NOA's website mean jack when when it comes down to the end result of it, but still, the information that Nintendo gets from them is still taken into some consideration when NCL asks what's going on in America.
No matter what the poll, though, if one choice is totally obliterating the other three, something needs to be noted about it. (The Zelda poll, while having the realistic choice winning, wasn't as clear-cut as Fire Emblem is in this one.)