That article states that Sony has a 45% stake in NEC. They aren't getting out of the market, just shutting down a particular division that is under performing. My guess is they will simply adjust production of their existing production to make up for whatever residual demand comes from the shutdown.
That's too bad. Those cheap Optiarc drives for under $20 and free shipping on Newegg were my go-to drives. I don't really care for Lite-On, I find that they are built cheaply.