It's a big win in aggregate for democracy, but to play the cynic a bit: the GOP has gerrymandered virtually every state it controls to the max, Jack. With the NC Supreme court flipping conservative and overruling the previous state Supreme Court anti-gerrymander decision, the GOP controlled legislature is likely to push the map to 11-3 or even 12-2. The last ungerrymandered GOP state is about to be dealt with.
OTOH, a ruling in favor of independent legislature theory makes the state constitutional anti gerrymandering statutes/laws in Maryland, NY, California, and Colorado very dicey suddenly. That's probably 20 competitive seats right there. And that doesn't account for if Gretchen Whitmer and the MI legislature decided to do a mid decade redistrict as well, or if Oregon strikes the Senate qourum rule preventing the unified government from doing what it wants. Again: it's a good thing in total, but they also very quietly shut another door for the Democracts to get out their self imposed habit of fighting with a hand tied behind their back.