I'm not sure about that one! I'm not much in favor of anything that does not expire at some point. That reminds me too much of Supreme Court Justices who hold their positions for life, no matter how bad they become.

Proxy-delegation refers to setting another account to cast witness votes for you. But for it to work it still needs for the active account to whom the voting power was delegated to keep renewing it's votes. The idea is to end voting power from chained accounts without an active voter at the end, but it doesn't need to require renewal of the whole chain, just the voter at the end of it.