There will be more demands for universal background checks - which obviously didn't interfere with this shooters plans, since he bought the gun(s) and armor legally. Ditto useless bans of various firearms, etc. No doubt some politicians and talking heads will push for a full-on door-to-door confiscation of everything that goes bang. Which would be a really, really, bad move.
I would like to think your are correct, ie that it would be a bad move in that citizens would resist. But I am not optimistic for 2 reasons.
1- if citizens do resist that would be this administration's wet dream of a total crackdown on all opponents, political or otherwise. Maybe up to and including martial law. Our young, post-Obama politically vetted officer corps of our military will march in goosestep conformity and enforce whatever they are ordered to do.
2- NRA will use it as a mega fund raiser, gun owners will wail and gnash their teeth, then, just as in CT, line up like sheep to turn in banned guns.
The
fact that the shooter passed background checks will prove to be a MAJOR reason that the left can use to say "see, even background checks aren't sufficient.
We must implement a complete ban on the ownership of most if not all firearms!"
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As an aside, Academy et al seem to have a very large on the shelf inventory of bulk packs of popular calibers at what are, in the current climate, reasonable prices. Just a note to the wise.