i'm not sure but it will happen!
for me i think bitcoin come out if the miners stop mining the coin or the dev's and investor stop supporting the bitcoin currency, i believe your question is very negative thinking because the dev's of the bitcoin currency not stop to continue the development about the decentralized cryptocurrencies so don't worry the bitcoin as of now is very strong.
I think Mr. Satoshi Nakamoto will create additional bitcoin if it will be happen to run out! I think it will be happen in the future because more bitcoin holder will come and hold bitcoin for long a period of time.