Whilst your post is accurate... There is a successor to Blu-Ray known as the Archival Disk which starts at 300GB - 1 Terabyte of storage.
Archival discs, as their name implies, are meant for long term archiving of media (like movies) and not intended for consumer level products:
“The development is specifically for professional archiving,” the Panasonic spokesman said. “We are not currently considering optical discs for household consumer use.”
In other words, those are probably too expensive to make or too fragile to warrant consumer products with them. In any case, I don't expect any consumer products, like consoles, with those.
Improved error detection and reduced crosstalk would probably work, but that would also make both the discs and the drives more expensive. Hard drives had to sidestep this by now and are using helium-filled cases (because helium has almost no air friction and is easier to handle than pulling all the air out, creating a vacuum) to allow for faster rotation speeds, and no dust and more discs inside the casings.
So yeah, like I said, more than those 100GB don't seem practical right now. It's technically possible, but very unlikely to be used in consumer products anytime soon.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/