> If this is the case, it's just a matter of time until costs can be reduced.

Is it, though? We cannot predict technological advancement, and the times of ̶M̶u̶r̶p̶h̶y̶'̶s̶ ̶L̶a̶w̶ Moore's Law* for computational power are long gone. There is simply no guarantee that the costs will go down enough.

* thanks lucianbr!