I was thinking the same thing. And the MO here is an "electronic attack" anyway, it's not like NK has been able to do much of any phyisical force projection outside of their own little corner. The "real threat" is that Sony will have even more internal documents leaked, and MAYBE AMC, Cinemark, etc could eventually get hacked too?
Seriously, what would the GOP (Guardians of Peace, not the Republicans lol) do? Fly over into the US and set fire to 5000+ theaters? Attack the US's critical cyber infrastructure and start WWIII over a Seth Rogan movie? Even though that would be the FUNNIEST reason ever to destroy humanity (they could film it and call it "This REALLY is The End, PS we're sorry!" lol), there's little the GOP can do outside of what they've already done.
Maybe if Sony didn't have unencrypted Excel and Word docs all over the place in their HR department and used an end-to-end encrypted HR solution like most other corps use this wouldn't happen. Maybe close off the $C, implement some vlans and VPNs... you know, catch up 10-15 years with the rest of the planet and it might make this a bit more difficult. Personally I don't blame the GOP...I blame Sony for having circa-1992 coffee shop security.