I have big hopes that when PS5 will be launched, optical media will be dead and that flash-memory has put the final nail in the coffin for magnetical drives...
http://gamrconnect.vgchartz.com/post.php?id=6244123
I hope by 2020 SSD like flash cards are cheap enough to be used as game cartridges. Back in the 90s cartridges out died due to their limited size but today they have more than enough.
There is already optical disk format announced with up to 1TB capacity, SSD won't be used.