If the anti-gun bigots in D.C. were smart what they should do is let the ruling stand, salvage what they can from the ruling and protect their fellow bigots in New York City, Chicago, etc.
It will cost the pro-freedom people far more money and far more time to find suitable plaintiffs and the circumstances to challenge the law in a different district. It also would add the complicating factor of states rights back into the legal landscape. Plus it’s another roll of the dice that might come up favorable to the bigots.
But they pride themselves more on their arrogant bigotry than on their smarts so my guess is they will appeal.