All the content your #Nostr private key has produced is one big #NFT. In the future people will sell, or leave in wills, their #nsec.
For celebrity accounts, the #nsec will become a prized collectible.
Discussion
The value of the collectible will become linked directly to the private nature of the #nsec. If it were ever to become public it would lose its value immediately. Additionally criminals would hide their knowledge of the public key and threaten release of it in exchange for a ransom.