It's both. Empty mempool means less incentives for improving lightning or other layers, but empty mempool also means that people can ~easily send their bitcoin in fully self custodial way with only a small fee.
Discussion
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I've already consolidated last year's DCAs at 3sat/vbyte. To be honest I'm prepared to pay more. I'm getting kind of worried about long time miners profitability. I thought ordinals and runes solved the issue of empty blocks and there will always be space buyers of last resort.
We are about to get load from Ark and bunch of others "ZK L2s" like Citrea that are close to launching on mainnet. So my take is that people should prepare for high fee environment in the next 6 months.