The PS3 will just be hitting it's stride at this point. And by the way, discs being used as a media for software and video will be around for a lot longer than you may think...think the next 10+ years anyway.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)