Unfortunately, In my humble and ignorant opinion it doesn't have nearly that much potential. The VPC is just trying to drum up hysteria in the anti-gun ranks in order to raise more money from the kooks and gun control freaks who support it financially.
The decision is actually quite narrow in scope. If I correctly interpreted what I read of it, it is tailored to strike down only those sections of the DC law that (A) prohibited registering a handgun unless it had been previously registered prior to a certain date in 1976, which in effect made it impossible to legally possess a handgun brought into the D.C after that date, and (B) mandated that a gun in the home be kept partially disassembled or made non-functional in some other way, and (C) prohibited a handgun to be carried anywhere at all, including from room to room of the owner's home.
OTOH if the VPC ranting is right, my ignorant opinion is wrong, (hope hope) and the SC grants a writ of certiori to a D.C. appeal of this decision, that situation would have the potential to give new life to the moribund 2nd Amendment and the VPC's worst nightmare could conceivably become reality. May God in his infinite wisdom and perfect justice grant that it turn out that way.
You do realize that none of the anti-gun organizations get any of their financial support to speak of from individuals? Like many, if not most leftist causes, their money comes almost entirely from foundations. Their position has no broad-based support other than totalitarians like the resident statist who has spewed all over this thread.