We wouldn't be able to remove signatures from the main chain retroactively
If you're going to rely on "social consensus" to define the validity of old blocks you can just create a new block ID scheme, and publish a checkpoint based on that, or even have one literal large BLOB+hash containing the entirety of millions of old blocks, and dispense with all other verification and data needed only for verification. It doesn't matter that old blocks didn't work that way, once you've decided to accept this snapshot going forward.
Its abZorbin time!
The neural net text ai stuff reminds me of newlife.ai where every photo you upload has a ai driven list of words it gleans from your post like an image of you on a couch with a lamp will for exmple say "couch" and "lamp" etc
Adding newlife.ai to hive would be so powerful as a hive dapp
Really cool the idea of social consensus