You're right. We'd all grab our AW's, drive our SUV's to D.C. surround 'em, smoke 'em out and pick 'em off.
There's two concepts that come to mind that are much more realistic than the "million gun march" on D.C. that seems to arise on the boards from time to time, either in earnest but naive origins, or in jest as more of a reductio ad absurdum.
First, a page of the play book leftist/environmentalist/anti-WTO/kumbyah set. "Think globally,
act locally." Translated into anti-totalitarian RKBA tactics, it means the local low-level officials are either too terrified to enact the dictates of D.C., or dead. It's obviously no gaurantee of success, but it levels the playing field immensely.
Second, the other is "MAD" from the cold war. In our terms it means, "Yes, Joe-six-pack RKBA believer won't 'win', but if enough of them are angry, the U.S. will devolve into balkanization, or become a Somaliaesque 'failed state'." And thus, both sides at least have a vested interest in maintaining the status-quo of our battered, but still functioning Constitutional Republic.