Software Distribution. Given that DVDs are currently what get burnt for most games these days and while they will continue to be layered to put more data on them, there will be a replacement sometime soon.

I think this will be flash drives. It provides a simple way for distribution. Just walk into a game store or computer store say you want X software. They check your flash drive and give you the data. When you install it does the same check on the internet that the current ones do. Every time it downloads to a flash drive it gives it a unique key like they have currently. Every time it registers it associates that key with your software there by giving the DRM that the sellers want while providing a simple access point that the buyers want.

You could even go so far as to have a suite of data that gets locked in that you can carry around. I figure this is where the Ubi Comp comes in. Say the flash drive is more like a stick of gum. With either a wifi on the tip or a RFID. this would give it the ability to handshake and update your preferences to things. Such as thermostat or background music. Or even which floor you will probably be going to in a building. The drive can be plugged in like normal and saved. Plus this keeps the data out of the cloud but still accessible everywhere. Sure you got to keep track of it but you keep track of your keys too.