More than sequencing fees, I could see sequencing logic and constraints imposed by the synchronisation block and L1<>L2 co-building coordination stand in the way of integrating current L2s with EEZ. Possibly future L2s too, those that have more the shape of semi-sovereign chains deriving properties of and interoperability with Ethereum via blobs.
I expect more success with L1 applications that are extending their functionality towards use cases best offered by the shape of a chain, e.g., "app-chains".
Will be interesting to observe how it develops!