Lots of stocks go down 5% in one day, especially medical stocks. Hardly steep.
Yes, it's a shame it didn't go down more. Until lack of security affects the bottom line, companies won't make secure devices.
Stock prices don't affect the bottom line (other than on a IPO of course) however a bunch of pissed off investors looking at their portfolio charts shooting straight-down would likely demand the heads of the CEO and the CTO. If the Board of Trustees doesn't deliver you might see a direct share-holder vote being called. That's when you would see some real change in the Industry. Nothing greases the wheels quite like the blood of executives