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Yeah it would be nice if there was vote decay that would dilute these stale votes and force people to revote if they wanted full power.

Yes, a vote decay. That's also a great idea. I have read about this discussion on Steem long back. It would be great if this can be implemented. Guess what, it won't be implemented. Anything that threatens the position of top 20 witnesses won't be implemented.

By the way, the proposal system also needs some fine-tuning.