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If the price of Bitcoin dumps, shouldn't we get lower fees ?
Even if it goes up for a few more months or even years who knows, there's a point where we will get small tx fees.
Both panic buy and panic sell could happen, so it's not strong guarantee we'll get lower fee (either in terms of fiat or sat/vB). In addition, attack by creating many transaction (when it's not needed) might happen regardless of Bitcoin price changes.