How do you get all miners to agree to this? How do you prevent miners from secretly retaining a key they "destroyed" in order to retain large volumes of wealth?
With a poison pill, if need be.
But let's hope it doesn't have to come to that... While gradual changes benefit the majority, an abrupt one would only benefit my ego and the pockets of those who had prepared for the change.
Also, why is it so bad that bitcoin acts like a "Gold 2.0"? The world needs something like gold that does't require physical storage and can be easily transported worldwide. Why would you want to destroy that?
It's not the qualities of gold that's the problem, it is the pervasive treatment of those qualities as gold. Speculation is healthy for the bitcoin economy, but only if it is based on the expectations about future "economic" growth, and not on the proliferation of GOLD 2.0 worshiping.