Below are the fees that rollups currently pay to the ETH mainnet
These are already tiny amounts
And here is a typical Base transaction - it shows that Base pays a tiny propotion of total user fee to ETH mainnet
And here is the current dominance of Base
It is easy to predict evolution if blob space grows 10 times - essentially L1 fees which are already miniscule will drop to zero, and there will be a single rollup surviving, which is Base
It is already estimated that Base shaved 50B USD of Eth market cap.
Moreover, Base has no plans to decentralize, and there is no economic model for anyone even provide Base fraud proofs, since running a fraud-detecting system in parallel to Base will cost lots of computational power.