To get the rare concept imagine what happens when the last drops of water are dripping out and you need more. Maybe because of a catastrophic happening, what ever.
You have to get new drips from someone who still owns some.
Usually the government will refill the glass and start again.
No way to "refill" Bitcoin again!
What would you give me for 21 drops of water, when your life depends on it and the glass is empty?