This might be what you are looking for
This site maked blu-ray and HD-DVD seem tiny and not even worth upgrading to, the industry should dump blu-ray, release HD-DVD as a minor upgrade.
Then focus on 3D Holographic Optical Nanostorage. Most people will probably be ok with DVD and HD-DVD for a long while, when it comes to home movies and so on, but over all time is running out.
Big players need big storage, now I am talking about storage of lots of data as the site says etc. Even if this isn't going to be cheap for home owners, I would whitout a problem buy a device like that, even if it would set me back 2000-3000 USD and price per disc might be 100-200 USD.
It is worth the money if you have that big storage needs, but there might be several versions and all that, nothing is done yeat anyway.
I would guess around 2010-2015 we will see this kind of storage for everyone.