DigiTimes has reported that Sony plans to stop selling optical drives for the PC some time in 2007. The company will instead focus on optical devices, like their DVDirect series, that are not dependent upon PC's.
With the view that the market for PC optical disc drives (ODDs) in Taiwan is approaching saturation, as seen by the NT$1,500 (US$45) price for 16x DVD burners, Sony Taiwan indicated it will shift its marketing toward optical disc devices not dependent on PCs, according to Sony Taiwan.

Although half-height DVD burner technology has advanced to 18x writing speeds and will be upgraded further to 20x next year, demand for DVD burners is not expected to increase, local industry sources pointed out.
I can't say I'm too surprised. It's hard to justify buying one of Sony's drives when you can essentially get the same thing, sold under another brand for half the cost. If you'd like to read more, head on over to DigiTimes.