Well, WW effectively is in her own universe. The solo movies are, for the most part, prequels to the other DCEU films that function perfectly as standalones.
I'm sure the same could hold true of Aquaman, potentially.
MOS, BvS and Justice League are the movies which were part of the 'core' narrative of the DCEU - and even MOS was arguably a standalone origin story.
So really, the moving parts of the DCEU are pretty separate - more so than the moving parts of the MCU. That makes them more easily replaceable if necessary.