I'm not sure. Under what circumstances would you want to have a timelock that miners can vote to lengthen? Maybe it could be useful in a vault scenario, where you have your coins in cold storage, but if a thief gets ahold of your private keys, you get time to notice the withdrawal attempt and petition miners to let *you* withdraw your coins instead (and pause the thief's withdrawal attempt).

super_testnet

bitcoin

Answering Objections to Drivechain

Thanks this is a good explanation. What else could that timecode marker enable? Can it be used in non-side chain applications in any way?