Governing magazine (online) has a short but good piece on how Bitcoin is starting to be used by everyone from Tesla to buy cars, to Miami to pension funds(!): Click Here
Cities and pension fund use of an unregulated, volatile cryptocurrency ought to concern us, since if pensions or cities lose money on what is essentially a speculation vehicle, it could rip away funding options for other things, like public banks.
Ironically, as Bitcoin, and even Dodgcoin, which Elon Musk may use to fund a city, come into more use, it may cause their values to shrink to more realistic levels. Bitcoin lost 1/3 of its value in 2 weeks in 2017. Look out below.