"The order?" What order? The President isn't going to pass down an order that is completely unenforceable and illegal order like, "X,Y,Z guns are hereby banned." That would just make him look foolish as by the end of the day his own people would have to get up in front of the public and say, "Um...we can't do that."
So you're saying SOME anti-RKBA executive order would be devastating for 2A supporters? None of the previous (actually enforceable) E.O.s have proved to devastate us. What threatened E.O., that actually could be enacted and enforced, are you saying would be devastating?
That's silly. First off, look up the phrase "
stare decisis." Then understand that the SCOTUS does NOT come to work in the morning and say, "Hey guys, let's pass a judgment on guns today!" It doesn't work like that. A case, fairly directly related to that specific issue, would have to be introduced in a lower court, would have to percolate through the queue of cases to be heard, be heard, pondered, and decided, and a judgment rendered, and then one party would have to decide to appeal it, and that appeal would have to be accepted by the next higher level of the courts, and the trial date come to pass and arguments made....and on, and on for YEARS. Eventually, probably after a decade, the SCOTUS would get the chance to decide if they even will entertain that case. And that decision would be heavily influenced by
stare decisis.
So, anti-rights SCOTUS judges are a problem, but they aren't a guillotine hanging over us that will chop off our rights entirely the day after their wrinkled butts land on the hallowed bench.