My best guess would be after a 150 years. That is when i think all Bitcoins will be mined.simply because Bitcoins can be divided into so many parts. And this will really help make the time before it all gets mined be a lot longer. Plus the amounts that can be mined everyday are decreasing. But let's say it ran out already, the price will rocket and become so so high. Amd it will lose its great volatility and become a currency that is most likely as stable as american dollars. That is what i think.