How and why would the end of bitcoin (and any other cryptocurrency) occur? Value decrease? Legality issues? Different technology/ideas to supersede it?
I don't think that bitcoin will die, it will have some value even if some new technology appear, people will collect it cause it's first of it's kind.
Everything around us is evolving, bitcoin will have the same destiny, and I think bitcoin will be only better with the time. Quantum computing is also technology, and why bitcon can adopt on it? For me all mentioned scenarios are lucky guessing, I think bitcoin is strong enough to survive all upcoming problems and threats.