In a few years geeks are going to look at games that take 10 gigs plus and laugh, as the games will eventually take up 100 gigs. Give it time.
I was just thinking about this earlier today. A few years ago, I got myself a 40 GB harddrive and thought that was plenty of storage space. About a year later, I got a 150 GB drive, thinking that should really be enough for a while. Fast forward about 2 years, I've now got a total of 3.5 TB of storage available and I have a feeling even that much won't be enough for long, considering how everything's just getting bigger. (I also do a lot of video-related work that takes up a lot of drive space.) A few years ago, I couldn't imagine how a game would fill one entire DVD (single layer, at the time). There's plenty of multi-DVD (double layered) games out there today and they're only getting crazier. Wait until they start shipping games that come on (multiple) BluRay discs. Can you imagine that? What's next?
Thinking about this now, less than 60 MB (the size of Duke 3D) is almost a joke. That's like, less than the size of an Ipod-formatted music video (!).