You are right about Bitcoin being eventually replaced. I mean it could take decades like the Model-T did. The first generation of new tech usually always ends up getting replaced at some point. I do think with a an established currency its probably not going away any time soon due to network effects of money and liquidity. However, the flippening by alts is inevitable. It can happen by the end the year or later into next year like you suggest. Ultimately, the users will decide and not the Bitcoin core developers. In my personal view, the future of Crypto will be all about user experience, governance, community, usefulness, store of value, fast cheap n' and scalable payments, marketing, effective developer teams and budgets. These are just some of the attributes they add to the overall utility of a token and ultimately is directly correlated to its long term intrinsic value.