Reasons to have higher L1 gas limits even in an L2-heavy Ethereum

Referenced by

The staker set of the L1 is highly decentralized, making it very difficult to censor a transaction for more than a few slots

even in a world where most usage and applications are on L2, there is value in significantly scaling, because it enables simpler and more secure patterns of application development

Vitalik Buterin calls for 10X L1 gas limit increase to bolster Ethereum security