It very well could be a good strategy to launch BTS at 4 billion shares but when the price becomes 'too high' have a shareholder vote (perhaps with a future DAC) to do a stock-split back to a more approachable buy-in level. Not only would it help avoid psychological walls, but it would also bring free publicity as people research the 'price drop' and could spotlight the flexibility of the network. I've found that many crypto-noobs get confused and irrationally frustrated (IMO) by coin divisibility ("wtf is a satoshi?") but completely understand stock splits as they're a norm in equities. Doing so would eliminate any need for a naming scheme for the units of divisibility; a bitshare is a bitshare.