Too Long; Didn't Read
Bitcoin has an increasingly large carbon footprint, potential threats to it being breakable, and specialized brute force attacks that are becoming increasingly complex. However, Bitcoin's cryptography hasn't radically changed in regards to these potential threats, and will need to radically change in order to be sustainable in the future. The brilliance of the system as a whole is the reason Bitcoin is thriving today. It is also likely the reason it seems to be ranking supreme. However, I think BTC can do better. I think the cryptography can become more complex.