It should be there but maybe changed so it would not require an HF to adjust. Like the HBD interest rate, witnesses could signal the fee rate.

So in case of an attack, it would be another tool under the witness's belt. If it all feels secure, they can drop it to 0 or close to 0. If the chain is threatened they could hike it up to 5% or even more.

It seems like a reasonable solution, but I haven't given it a deep thought.

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