Bitcoin might be stable and be called cryptocurrency king now. But don't forget that ideas and solutions change very fast in the blink of an eye.
Remember Yahoo? It once was the greatest company of modern Internet and then Google came. With bitcoin could be the same.
Yes, do include JDS Uniphase and Cisco Systems as well, both companies were thought to be on the path to becoming the largest companies (by market cap) in the world...
Where is Microsoft now? Not Number One. Apple may seem invincible now, but we will see what the future brings.