Well, a decline in physical media sales implies a decline in demand for players. Oppo might reasonably decide to get out of the market before they end up taking a loss on unsold inventory. But I agree with you that that doesn't seem to be the reason behind Oppo's business decision. Maybe consumer electronics is only a small part of a much larger operation. Since they've taken the players as far, technologically, as they are likely to go (setting aside possible 8K in the distant future), it may be that the company's masters in China view consumer electronics as a distraction from whatever they consider to be their main mission. It's a good time to pull the chain on the operation.
As for me, I have an Oppo BDP-83SE from 2009 that was recently serviced by Oppo Digital. It still performs well, especially now that they've cleaned out all of the "animal hairs" (don't ask!). I've had a very hard time bringing myself to break open the piggy bank for a newer model. If I finally decide to spring for 4K, I'd probably buy a cheaper 4K Blu-Ray player to dedicate to that task, leaving hi-rez audio to the existing Oppo. TBH, most of my listening since I got my BDP-pi earlier this year has been to the numerous CDs I've ripped. The Oppo player doesn't get turned on very often these days.
I'm baffled by James Tanner's comment wondering about the future of CD. Surely his company has already given much thought to this, and he has been party to the deliberations.