We all know that tech will surely be replaced over time by even greater and efficient piece of tech, but seeing bitcoin being used largely as an investment and not a currency, I'm pretty sure it will not get obsolete, not yet. As long as people believe that something has value, they'd still use it and willingly accept it, just like gold for thousands of years. Also, people are now being introduced to cryptocurrency, so perhaps this is just the dusk for bitcoin and its brothers and they still have a long way to go down the road. Hopefully they're utilized as currency and not just another investment vehicle which most people think will bring them riches quickly.