I think the so-called altcoins will continue to develop. In the end: 1. Bitcoin will not be the only virtual currency that has a monopoly. More mature virtual currencies that are not vulnerable to 51% attacks are recognized by everyone. 2. For a particular virtual currency, the people who recognize its value and the total computing power participating in the coin mining jointly determine its credibility. 3. Between different virtual currencies, there will be "exchange rates", and everything that happens on physical currencies will also occur on virtual currencies. 4. Due to the initial 51% attack problem, there will not be many virtual currencies that survive.