If bitcoin replaces the dollar as the unit of account, currency of international trade, world reserve currency, and so on, it might be better simply to spend the bitcoins than to "sell" them.
If that ever happens, our homes are gonna be visited by flying drones. But you don't need that to happen for Bitcoin to make you rich. It could very well just stay as a high value, scarce commodity. A few whales buying in can make it happen.
