I'm betting on option 3 : A few more days of liberal "pundits" still trying to push the SP/TP 's fault meme, to declining numbers of readers and interest, while conservative thinkers push back, in the print media and on the radio (most of their readers and listeners are already conservative so this will mostly be preaching to the choir, but some of their points will spread to the 'undecided/moderate/apolitical). A few big mouth congressscum will try to use this atrocity push anti gun/anti free speech measures, all of which will quietly die in committees. Business as normal some time next week.
And hopefully Giffords will make a full recovery and return to work before the end of the year.