We know, at least right now, that the republican controlled house/senate are taking this information nowhere. And we all know solid liberals and solid conservatives aren't going to change their candidate selections or party line voting based on a single issue. And on this issue, I think it's safe to that people slightly left of center vote for gun control and always have and people slightly right of center vote against gun control and always have.
Which leaves us with the real question:
Which voter is more likely to cross-center to vote on the gun issue in the 2018 and 2020 elections...
a) Will more left-of-center and centrist gun owners cross over and vote for an NRA endorsed candidate.
or
b) Will more right-of-center and centrist people people cross over and vote for gun control.
I predict "a" will win out because people that vote on gun issues tend to have a very strong turnout and a very long memory. They also have a giant organization (NRA) informing them very well on candidates' gun stances and they distribute voting cards much the same way unions do.
As sad as it sounds, as time wears on the recent tragedy that undoubtedly produced these poll numbers will fade in the memories of group "b" and they will become impassioned in some other more recent movement or scandal by the time the 2018 or 2020 elections roll around. Happened after Virginia Tech, Movie Theater, Newtown Pulse, and San Bernadino shootings... there's nothing indicating it won't happen again.