Each Bitcoin will have the buying power of between 1 Million and 100Million Dollars does today, why, because Bitcoin is a finite but divisible currency AND it has the potential for complete privacy in financial transactions, for that reason, once the masses understand this, there will be another Gold Rush.
Think of the potential to be able to send your children £20 without requiring a Bank, or Govt, it will be too temptig for businesses too.
Though they may try to fight it, Govt will have to come round to our way of thinking.