In principle, you’re saying because there is a new asset that is a better form of money, there’s no reason to hold the old asset. While I understand what you’re saying, it doesn’t bear true in the real world. Look at gold and BTC. Just because BTC showed up, gold didn’t go to zero. It takes generations for value to transfer from one asset to another, and even then, the prior asset’s value doesn’t go to zero. It’s very hard to say winner takes all when that hasn’t been the case in all of history.