They claim to have been "the market leader for optical recording media", although I suspect they were not leading in volume or revenue. The blank disc market is basically gone, so it doesn't hurt them to get out of that business.
But the era of optical disc recording is gone, so it's a good decision to close blink disc business from business view.
For normal people like me, just have a felling that another era is gone, like the floppy disk, PCI sound card, dial-up modem, CRT monitor, film camera and so on.