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.
This is a huge ruling if Democrats take back the White House in 2020. The court ruled that Texas' map was discriminatory in both practice and intent. If the intent part is upheld, Texas will fall into Section 5 preclearance, meaning the DOJ would have to approve any changes to Texas election/voting laws, like decennial redistricting,