Yeah, I think people are more likely to branch out into mini PCs. I've seen as many people purchasing them in addition to their towers as there are making them their sole computer.

I myself went for a larger case after 3 years with a Dell, trying to fit too much into that tiny proprietary case, and they've only gotten worse in that regard. Granted, I went a little overboard with the PC75, but like you said, now I have plenty of room for all those hard disks. I couldn't have kept every hard disk upgrade running in my Dell case, especially not now that there's 4 disks in there with room for at least 7 more