These terms don't exactly trip off the tongue. Surely it's simpler and cleaner to move the decimal point and call the adjusted unit the bitcoin?
Eventually at most only 21 million coins for 6.8 billion people in the world if it really gets huge.
But don't worry, there are another 6 decimal places that aren't shown, for a total of 8 decimal places internally. It shows 1.00 but internally it's 1.00000000. If there's massive deflation in the future, the software could show more decimal places.
If it gets tiresome working with small numbers, we could change where the display shows the decimal point. Same amount of money, just different convention for where the ","'s and "."'s go. e.g. moving the decimal place 3 places would mean if you had 1.00000 before, now it shows it as 1,000.00.
Moving the decimal would work if people didn't get confused. If we move the decimal then there will be more than 21 million coins, and then panic would ensue even though we haven't actually increased the number minted. I wouldn't mind moving the decimal 3 spots and seeing ~700,000 coins worth $1.2 each in my wallet and increasing, but it just won't work.