Yes, but if nobody else values the output of your particular fork, it hardly matters.

The community ultimately chooses which fork you run if you want to actually participate in a monetary system. Really, that's all this argument is -- any currency exists within a monetary system that is willed into existence by its participants, and no amount of maths will ever change that. It's not like gold had much use for the majority of its history, and yet it became the dominant currency.