The DOJ, The Obamaniac, and the federal government CANNOT do just anything they want to, whether they think it's the right thing to do or not.Why not? If the DoJ can prove that current discriminatory practices and actions warrant federal interference, it has none of the problems they had with section 4 being a permanent trap for the states named.
The Court might have a conservative bent, but they aren't really that big of a fan of states rights.
Whether you like it or not, the STATES have RIGHTS that the U.S. Constitution FORBIDS the POTUS or federal government from trampling. And FOREMOST among them are voting laws. The states can basically set whatever requirements they want, the federal government be damned. They don't even have to allow the average citizen to vote, and for many decades, many states did not allow the average citizen to vote.
Even though South Carolina was one of the Original 13 States, South Carolina did not allow the average citizen to vote for POTUS for nearly half a century. The first POTUS election where the average South Carolinian white male property holder could vote was 1836. That is the RIGHT of a state.
We are a nation of STATES, and STATES created the federal government. NOT the other way around.