https://bitcointalksearch.org/topic/m.687909
Basically what I was going to pen after reading the OP.
I believe that 'Satoshi' is reserved for the 8th decimal place. There's a thread discussing name proposals for the other decimal places, but I didn't take time to hunt it.
If I'm not mistaken, there's going to be a problem if we start using .xxxx? Humans are accustomed to whole numbers, not fractions or decimals, when it comes to their medium of exchange--money. At the moment, there's 8M BTC in circulation. If next month a million new people joined the Bitcoin train, not only would the exchange rate be high, but everyone will be seeing .xxxxx no matter what name you call it (nano, being one that just came to mind).
There is one way I can see it working out for all concerns, and it's not meant as a proposal--just a brain fart, if you will. Currently there are 8M+ BTC. Let's say a million new people join. The rate becomes 1 BTC = $100 USD. Even though a $2 USD purchase equates to only .02 BTC, people are less prone to purchase 1 BTC for $100 USD. But if it 1 BTC = $10 USD, all is well again. That can be done by a split. There will then be 80,000,000 MAIN units in play, units that will be called Bitcoin (bitcoins). And when we reach the 10M original bitcoins mined, and there's another doubling or so new users, split again to having 1,000,000,000 units now referred to Bitcoin(s).
This way it's always called Bitcoin or bitcoins or BTC for the main units. Perhaps this can all be done at the mining level during the awarding of BTC blocks.
As I've said earlier, it's just an idea, and I real don't know how to do this or, for that matter, what I'm talking about, let alone trying to relay. But. hopefully, the gist of it comes across, even if the whole thing is shot down.
~Bruno~