Neither Smooth or I agree with Anonymint about BTC mining having a predictable endgame.  It's entirely plausible that commoditization of sha256d could make most big mining farms extinct, with the only miners remaining being people that use the waste heat to power some other type of utility:  water heaters, central heating, industrial use, etc.  You might risk the utility company diverting hash voting power for nefarious means in such a scenario, but what are the odds the utility companies of the US, North Korea, Iraq, Iceland, and whoever else all collude?  It's impossible for Anonymint to know what shape mining will take in the future.