We already have laws that govern when (and how) the data on our personal devices can be accessed. As technology becomes integrated into our bodies, the same laws will cover them.

In the long term, I suspect that a vast number of alternative cryptocurrencies will be created. This churn of new cryptocurrencies will produce quite a few duds, scams and fads, but at some point the idea of creating a cryptocurrency won't be as cutting edge as it is now. Then the churn will slow, and we'll be left with a handful of serious currencies, each of which has a unique use or attraction that makes it viable in the market. We need more than one cryptocurrency so that people have a choice. If there are several currencies, then the competition will spur innovation, the value of each currency can stabilize against the others somewhat and no single market crash or overlooked security concern will bring down all of them. Urging people to boycott alternative cryptocurrencies and use only Bitcoin is shortsighted and harmful.