brent Maybe we should define at what point the 'average' user crosses into the 'super' user because then resources/space matter a lot more.
Another interesting question, but a simpler question, I think, than "When is old old?"
To my simple mind, users fall into three loosely defined categories:
Casual - Uses Solus for e-mail, browsing, online banking, shopping and bill payment, creating/editing occasional simple documents and spreadsheets, looking at photos, listening to music, video streaming and simple, casual gaming (e.g. Solitaire and Mahjonng). Uses Solus OTB applications and needs nothing more. Works in a graphical environment and would be lost in the terminal. Not interested in configuring the DE. Stores 1-2 GB data.
Average - Uses Solus for e-mail, browsing, online banking, shopping and bill payment, creating/editing more complex documents and spreadsheets with some frequency, looking at photos, light photo/image editing, listening to music, video streaming and mid-level gaming (e.g. Steam). Uses Solus OTB applications but installs 5-10 applications for specialized needs. Works primarily in a graphical environment but occasionally uses terminal commands. Lightly configures the DE using tools provided by the DE. Stores 5-25 GB data.
Power - Uses Solus as Casual and Average users do, but in addition uses Solus for programming, development, intensive graphics/video editing, high-end gaming, and other purposes above and beyond the needs/scope of an "ordinary home desktop user". Uses Solus OTB applications but installs a relatively large number of additional applications, some resource-intensive, and may substitute applications. Works primarily in a graphical environment but frequently uses terminal commands and scripts. Often heavily configures the DE working environment. Comfortable configuring complicated and not-so-friendly OS/DE combinations. Stores large amounts of data. May set up complex network/sharing environments. Often uses VM's. Probably has programming skills and a background in a professional IT environment.
I am aware how loose and undefined these categories are, and I am aware that categories shift over time as users change. I don't think that the different categories can be described with any precision, but I've taken a shot.