With very cheap energy, the cost of production is greatly reduced. And if a person is replaced by a robot, who does not have to pay a salary, but only buy it once for $1000 (in the future this is the real price of the robot, even cheaper). We will get very cheap prices for goods, but many people will earn less money (for example in the equivalent of gold or Bitcoin or HIVE). Although, if every person has robot assistants, then making money can be left to them. The issue is the distribution of capital by the state for its citizens. Probably in the future there will be a life of abundance for most people :)