It's ironic that you mention the printer, considering at my office, I slowly started teh transition to Macs for everyone. Printer installs were always the amusing thing as it was like "Click +, find it on network, hit install, print" in OS X.
In Windows, it was always 10 minutes searching down drivers on the website, installing them, rebooting, then hoping that the printer still gets found on the network from Windows search thing (which it wouldn't, which entailed entering the IP address.. until the IP changed because someone else ****ed with the router).
When it became so easy that my non-IT savvy boss could install printers for everyone and even do basic troubleshooting which meant I could spend more time developing.. I don't know why people would use Windows for anything other than playing games. Linux is still not ready.. it's closer, but when AAA titles still launch as Windows only, Linux isn't an option yet for games.
SteamOS won't ever mature past being a slim Debian that runs Steam. Valve has no intent on actually evolving a desktop OS. The fact that they even bundle a runtime inside of Steam, separate from the system's library set, which games are supposed to target and use is further evidence of this.