What Bitcoin needs is a wallet that allows users to timelock their BTC.

There's already a timelock feature in Bitcoin, and from research it's been a feature since 2009 where you could specify at which block height it'd release, and approximate a time and date. I can't for the life of me find him, but there is a person who timelocked a massive amount of bitcoin to be unlocked when the last halving takes place in 2140. That's not the crazy part, though.

The crazy part is that he made the private key of the wallet public. Yep. Made a goddamn statue out of that key as well IRL.

I'm not entirely sure how this works on the Bitcoin network, though. Is it like a transaction that's broadcast onto the mempool, but the miners are forbidden from including it in a block until a certain block height is reached?