Yes. It won't happen for mining though. It will only happen if trading justifies it, but off the chain transactions can already be done sub Satoshi, so why bother? In order to have billions of people trade in bitcoin you need to go off the chain anyway so even for trade there is no practical benefit of more decimals. If by that time a Satoshi would still not buy you a meal, people wouldn't bother changing things as fees will buy the miners many meals if Bitcoin survives to that date.

Edit: My assessment about fees might be inaccurate. There is also a possibility of mining turning into an expensive effort with no reward from the ordinary bitcoin users, run only by those with high stakes in Bitcoin merely out of their own pockets.