p1fel,
The assumption is that all people are now online. This isn't always the case, of course. Printer drivers are often more up-to-date download from the manufacturer, than the disk in the box. Movies can be downloaded or streamed. Again, this isn't always the case.
If you need a DVD rewriter, you can pick them up for peanuts. I've got one for one of my MacMinis and it cost £25 from Tesco. Works a treat.