The market adopting a convention of two decimal places is much more important than what the unit is actually called. The poll is already split to allow those who prefer mBTC to select their preference, splitting the millionths option would have also biased the poll.
When I did the OP I was unsure of whether bits was the best idea. Since then I am coming to the conclusion that Satoshi starting Bitcoin with an eight decimal place unit was his biggest mistake.
Changing a convention must be performed with caution and picking the wrong name could ruin it all, so in my POV, what we call the unit is very important.