If you move your money it's used. If you don't touch it for 100 years the hash function will be cracked and the "sunken" money can be reused. If you ask me: another ingenious feature.
& if it isnt touched in 10 years? 5 years? 1 year? 6 months? when was the last time you 'touched' your retirement account? & cracked hash function is a different issue.
It cant be recovered if the hash function isn't cracked as far as I understood. Cracking the function takes time. Therefore moving your money before 100 years or so will make it used.