Yes and it will going to be dead if no single person is still using it which means we got a zero (0) demand of bitcoin already. But that seems to be pretty impossible because bitcoin is already a mainstream and looking at its market cap makes you believe that it's impossible that bitcoin dies in the future.
I find that hardly to believe. As long as there's a fixed supply of Bitcoin every year, I'm pretty sure the demand will not go down, as well as its price. And even if its in the mainstream right now, and even if many country are already accepting it, still there's always possibilities for other coins to catch up. Maybe not in the price but its integrity and consistency.