The value of bitcoin depends on a lot of things i would say it is the first coin that is the one and most important thing also it is one of the best ideas and people want it is wanted at the moment but that is also because of the price more and more people are starting with it.
Bitcoin is only a tool to support the existing blockchain technology that are being develop today by many investors which believe in projects they choose. Pertaining the value of bitcoin, because many people invest on it, the supply of bitcoin increase due to the rising in the demand of potential projects that would have higher return of investment if successful. Popularity maybe a factor but I think its the performance of the project would be the basis of its value. If bitcoin will be a big contributary to those project, then the value of bitcoin will rise as per demand of it will also increase.