My 2 cents worth:
The NRA is first of all an organization (bureaucracy if you like) and will act like one. This will also go for the federal government, the RMEF, and even BHA. For them to have a position means that the management has blessed or condoned it, and that they plan to take some action on it. Apparently, at this time the issue has not worked its way far enough up the NRA food chain for a position to have been developed (even as a knee jerk reaction). Alternately, and this may be the most likely, their position is to ignore it and hope it goes away. As I see it, our job is to help them do the right thing by letting them know that our membership dollars and contributions depend on this issue and not just Hilary bashing. Telling them that they will not get another dime from us just tells them that they might as well ignore us. "I really want to renew since you do good work, but I am troubled by the NRA's lack of action on public lands."
I think that it is worth staying engaged with the NRA, since they have significant influence. They get a lot of advertising dollars from ATV manufacturers and other entities that may be at cross purposes with the public land hunter, so it is likely to be a long pull.