[eecks]

So how could you use these private keys now? Considering they're not seeds.

EDIT: downvoted for asking a question

[bayesianbot]

I can still import a wallet from at least 2012 and move the coins using the official client just like it was created yesterday.

edit: and obviously you can't remember that but if you encrypt your wallet you can save it to long term storages like Dropbox / differrent servers / medias / etc, what Satoshi would most likely be doing

[chill1]

Any one of those individual private keys could be imported into another wallet software application (e.g Electrum). Then the funds can be swept to a newer wallet that has a seed backup.

Private keys are just numbers. That has not changed since the beginning.

[CydeWeys]

They're still supported by most if not all wallets.