I wouldn't worry about this. EU nations have been ignoring the ECJ decisions left right and center. Including decisions about core treaties.
Free movement of persons? Not on French borders. Correct taxation? Not in the Netherlands. Rights of children in Youth Services? Not in Denmark, thank you very much. Fair spreading of immigrants? Is there a single EU country respecting that treaty? Maximum occupancy standards in prisons? Same.
You see, an ECJ "victory" does not give any non-theoretical rights to the victors. You cannot demand the decision be executed. You cannot demand damages if the court goes your way and the country refuses to implement the decision.
One might ask "then what's the point of laws in the EU?". You could ask that about a lot of EU systems ...
This isn't like the US supreme court.