You should always finish a course of antibiotics even if you get better sooner
This requires proof. According to a recent BMJ article there is none.
Robots will not cause mass unemployment
Bitcoin is failing as a crypto currency
When the price of the coin falls below the cost of mining it it will become worthless
This concern is no different than the question what will happen when all the bit coins are minted
When the price of the coin drops, there are less miners so less competition for coins so the cost of mining drops