Well bitcoin started it all off. Bitcoin is blockchain 1.0. Ethereum is 2.0. And cryptos like ADA, EOS is 3.0. Bitcoin I think will eventually be superseded even if it does take some time. However, successful implementation of the lightning network can make it stay alive much longer. So we'll see. Time will tell. If bitcoin doesn't implement the lightning, it will be a matter of time before it loses its top-seed position. If it does, we have to see how well this technology works. If it works really well, bitcoin may stay relevant for a very long time.