Bitcoin absolutely is financially viable in the long run. Why? Because it remains within a decentralized mining market. The idea that it costs $1000 to mine a single bitcoin is irrelevant. Why? Because when it costs too much in electricity and equipment resources to mine, miners will stop mining. When this happens, the value will go up because of the scarcity. Then mining will become viable, again, and the miners will start to mine again, thereby stabilizing the Bitcoin value. There are other factors that will keep Bitcoin popular. One of them is that other companies are making side-chains that are connected to the Bitcoin blockchain. Take a look at the Omni Layer - https://www.omnilayer.org/. These other companies will keep Bitcoin alive for a long time by making it practical OUTSIDE OF ITSELF.