There's something reminiscent in the court's ruling in Shelby County
with the court's ruling in the Civil Rights Cases
over a century ago. In that instance, the court held that blacks no longer needed to be the "special favorites of the law" and that it was time for them to stand on their own. That was in 1883. In a similar way, the majority in Shelby County
thinks that blacks might have been discriminated against in the 1960s, when the VRA was needed, but that no one could possibly try to discriminate against them today.
And parenthetically, if anyone wants to look at an example of "judicial activism" - i.e. the court acting like it was a legislature - the majority opinion in Shelby County
is a good place to start.
This decision will likely have a greater impact at the state and local level than in federal elections. There will probably be a rash of laws - redistricting, changes in forms of municipal government, and especially voter ID laws - that will be enacted in areas covered by the VRA. At the federal level, however, I think Republicans are quite content with black majority congressional districts in the deep South, as these make it easy to concentrate Democratic voters in a few districts while allowing Republicans to claim slim majorities in the remaining districts.