You can truncate it at any point you want. If in 2060, the community collectively decides that the chain is too long, they can just decide that a block from 2040 is the new genesis block.
Re:Crypto lobbying is going ballistic
by denton-scratch on Thursday December 09, 2021 @05:38AM
(#29495897)
By 2060 I'll have been dead for about 15 years.
So if people divest from bitcoin and the price drops, that won't make bitcoin more suitable for buying stuff. Nothing can make the blockchain shorter.