The bigger picture is Digital Distribution. Digital distribution is the future. It's not a matter of whether or not we will adopt it but rather how fast we will adopt it.
For portable computers to get rid of disc drives for good, the entertainment and software industry must overcome the following obstacle:
When a consumer buys your product, he is purchasing the right to use your product. He is
not purchasing the right to use your product on a particular machine or media.
When a consumer buys a song or movie, he should be buying the right to listen or watch it however he pleases. The current problem in this is: How do we protect these industries from theft while giving the consumer such rights? No one has a concrete answer just yet unfortunately. The industry needs to find a way to prevent the high degree and ease of unauthorized content duplication and its unauthorized distribution.
But eventually, all computers will just have internal storage and a connection to the "cloud". Your personal computing belongings will live there and you can access them whenever you please. The contents in the cloud will feel like they are stored locally but your internal storage will actually be used like a swap partition (temporary local storage for immediate use... much like the service the cache provides to the processor with respect to the RAM). Need to reinstall your OS? No problem! Just boot into a special menu (without the need of your main OS) while connected to the cloud and everything will be taken care of (This will be the eventual use of linux distributions installed within your motherboard).
The user/consumer will essentially be put in a sandbox of content that is half local and half in the cloud but he will have no idea it is. He could be on any computer or device and use his content as long as he is logged in. Only one instance of his user can be logged in at once of course.
Being logged into your OS will also mean you are logged into the cloud. Much like XBOX Live.
The internet infrastructure is not ready for this high volume of throughput just yet. The entertainment industry is just waking up to this concept with sites like grooveshark.com and hulu.com. They are just dipping their toes in the water with these sites at the moment and testing consumer interest in such a market model. Once these sites turn on their subscription model, they will have to provide service to all devices. Your cell phone, your car, your laptop, your tv, your home and portable gaming machines, everything really.
We are about a decade away from the full realization of this reality in my estimation. The Optical disc drive is here for at least a couple more years unfortunately for the reasons stated earlier. Same goes for Portable storage media like SD Cards.
Now that cell phone carriers are providing internet access, your camera will send pictures and video to the cloud wherever you are instead of storing them on a media which you have to bring to your computer. When you get home, you log in and your pictures are all there ready for you to use.
Any portable device will interact with the cloud. Everything you will use, will be interconnected no matter where you are and what device you are using. Everything you do in real life with digital devices will update your cloud sandbox on the fly so you can go about your business no matter where you are or what you are using. You will have a virtual identity that is as important as your real life one because they will be both joined at the hip.
Portable solid media will eventually be useless and you will be happy about it too.
These are exciting times people!