No. That would just work in their favor in that it would let them see those they oppose en masse. Such a march would be majority white and male, playing right into the hated male archetype--individualistic, self-reliant and everything else the left hates. It would reinforce the othering of us, except that I am female. There is something most of you guys have to understand: they hate you. I mean they really hate you and wish you were dead. I live and work in a liberal area in Vermont and am exposed to a constant diet of vehement hatred for white males.We need to march on Washington DC either during or right after the inauguration... millions of gun owners (no guns), the same way they did after Trump's inauguration. We need a coherent message, showing that we support legal ownership, semi-automatic weapons and don't support illegal possession (which is what most crime is committed with).
Also, the rules have changed for the legislative process. It's mob rule. Even with the US Senate at a slim Republican majority, no Republican Senator is going to hold out for long while he or she and his or her family is being relentlessly harassed by disarmament enthusiast mobs who are stalking them and calling them murders. Republicans in the leadership class will cave in no time. After all, they don't really care about the 2A or owning guns. Platforms change, and the GOP's will to benefit those who want to maintain power.
We might be stunned at how quickly we end up under a federal regime of highly restricted gun ownership.