I think the fear is:

- mempool depth has become a demand proxy metric

- it makes mining profitability less predictable

If L2 adoption means less demand for on-chain transactions, but we want full blocks, there are two types of solution:

- developments that reduce L2 activity that pushes things back on chain

- mind blowing L2 growth that makes "rare" L2 on-chain events fill whole blocks

One of these is more appealing to me than the other