@ucme Yes, I know you’re being sarcastic, but consider the following.
CAT5 still exists and is in common use because wifi has it’s limits. The biggest use for CAT5 is for connecting systems in areas where wifi is spotty or unreliable. I have a buddy who lives in a house that uses aluminum studs in the walls, making wifi impossible and cutting off cellphone reception as soon as you step inside; the whole place is like a Faraday cage.
It also has a bit less latency than wifi, which is very important to some of us here who play the sort of games where the difference between 49ms and 124ms is the difference between life and virtual death. That is why I have a cable running down my hallway and part of why I don’t game on my laptop. The ability to plug all your computers into a giga-switch and transfer data between them at 1Gbps instead of the up to 150Mpbs of a regular 802.11n wifi router is also handy if you have a home LAN.
Security is also a bit easier; while wifi routers can be setup with “whitelists” to allow only certain devices on, MAC addresses can be spoofed, allowing access to your home LAN. However, when an intruder has to come into your living room and plug in a cable to leech off of your internet, the system is slightly more secure.
Of course, as the sales of netbooks and tablets shows, casual computer users could get by with something on par with a Pentium III, and if not for YouTube and NetFlix, they could also survive on 28k dial-up anyways. Being able to do so without wires is merely a convenience.
If it really were “playing Flinstones”, we wouldn’t still be doing it. You give up a lot for the convenience of avoiding a wire, and in some applications, plugging in a wire is a small price to pay to get all that back.