if you like radio, wait until you see tv! it's like radio but so much more! pictures! in color!
colored inks have been out a long time. yet virtually all books meant for reading are printed in black ink on white(ish) paper.
eInk has hardly matured. i expect contrast and resolution to improve over time, as well as portability and refresh speed. batterylife as well.
OLED *may* be used in some portable devices in the future but i don't think it is the death knell for eInk-based readers. i don't even find the arguments posed in the article all that convincing. it actually strikes me as being written by someone who has probably never read a book on an eInk device.
i would agree that sony is on shaky ground tho and i don't think their bookstore will see 2010 personally.