That would not be an appeal, just a en banc hearing.
I don't think the judges who comprised the original panel are generally excluded from the en banc hearing, but I'm not real certain of that The district will likely ask for one, if they haven't already. The circuit court might deny that request, leaving the District's only choice, unless they want to defy the courts, to be to appeal to the Supreme Court. Again the Supreme Court can deny the appeal, in which case the ruling stands, but only applies in the DC circuit. If they hear the case and uphold the ruling, then it applies to the whole country, and we win a big battle bu the war to defend the second amendment will go on.
If the Supremes reverse, the second amendment is a dead letter, and we might as well get it on now, not later when we are disarmed, which with demonrats in charge of Congress will happen sooner rather than later.
It would certainly signify the end of Claire Wolfe's "awkward stage."
"America is at that awkward stage. It's too late to work within the system, but too early to shoot the bastards. " - Claire Wolfe