So far these court victories haven't won dems much. A gain of 1 seat in Virginia, a net gain of 1 seat in Florida. In North Carolina the republicans simply inserted another "gerrymander recipe" and moved on without any losses. As a result, I have little reason to believe that this will result in large dem gains.
The more victories keep stacking up, the more important it becomes. You can look at these individually and say they don't matter much, but together it adds up, and when you are in a hole like the Democrats, every little bit counts.