I am leaning towards this hack being an inside job.
Why?? well, leading up to the hack, scrypt hashrate was and still is exploding, rather than upgrade equipment and capacity they simply "upgraded" the minimum share difficulty. As they approached max capacity again with BTC price exploding and NH wallet full, the simplest solution for them, rather than deal with the hassles of hardware upgrades, troubleshooting, downtimes, complaints etc was to just pull the plug by feigning a hack and then walk away.
Just a theory , I personally hope they start back up. Maybe they'll use the downtime to upgrade and reopen, hurray, if not ... see prior paragraph. It'll be interesting to see how it plays out
rather than give part of the company away and raise funds let's just take the money we have to give to the customers and restart the service. They lost their money I am not sure why they keep saying it's our bitcoins they lost.