^_^ That made me smile a bit well played Lophie it is a sloth.
As for the technical discussion mining is dynamic since it follows that increased processing power is constantly required to mine.
Factoring in energy costs to determine if something is profitable always needs to be taken into account.
Example time it takes for chips to hit mass scale can seriously be impact profits with a month or two in this space.
That said FC should be fine based on the timescales we know.