Not at all, rewiring a building from say old Cat5 to Cat6 is one of the most expensive things one can do.
We're not talking about upgrading Cat5 to Cat6 any more than we're talking about replacing wireless APs and infrastructure as technology advances. There is always a cost associated with upgrading technology. Enterprise grade wireless equipment paired with enterprise grade desktop wireless cards and maintaining that wireless environment is most certainly more expensive than dropping cables and using the standard equipment that comes with every workstation. Any business that ran Cat5 to the desk and is now considering moving to Gigabit Ethernet with a need to replace with Cat6 got a solid
15-20 years of performance out of that original cable. And for all intents and purposes they could keep waiting and keep using that perfectly good Cat5 for a 10/100 network which works just fine for most business needs and is still faster than 802.11g. Cat5e was available in what, 1998? So any business that used Cat5e in their installations in the past
15 years is still perfectly ready for a full GigE LAN at least until whatever the next technology is becomes affordable and reasonable for business. It's not like businesses are re-running full cable drops every two years.
Wireless have been secure and reliable at the Enterprise level for a long time now.
Enterprise level wireless encryption with certificates and smart cards and RSA tokens and all of that is definitely more secure than your typical Linksys router with a WPA2 key. It's also crazy expensive and no, it's not as fast or as reliable. All the security protocols in the world don't help you when the microwave in the breakroom and everyone's cell phone sitting on their desk interferes with their wireless connection. And wireless on a fundamental level circumvents the most basic physical security measure of a wired connection: physically needing to be there and plugging it in.
Future 802.11ac can handle these loads.
Hell even on most wired LANs you can get saturated by a few users, many same businesses are dealing with DSL or cable connections.
I'm cringing just thinking about trying to cram 200+ employees all into one building using exclusively wireless internet. There's absolutely no business reason I can think of to justify the extra headaches compared to dropping cables right to the desk. Its more money and more frustration and less productivity for... what benefit exactly? Not to mention that no business in their right mind is going to design their network based around the idea that the technology will "eventually catch up to our needs with a new standard." You don't spend money on something that doesn't meet your needs already unless your goal is to run your business into the dirt.
And if your letting an enterprise network become saturated by a few users, your network engineers aren't doing their jobs. Even the most simple QoS configuration totally prevents the scenario you just described.
It's clear you're really into wireless, and thats great, but you still haven't brought any evidence to the table to indicate that businesses are getting ready to dump the wire and go all wireless outside of maybe your local hardware store with one PC and a residential cable connection. Either way, this thread has been derailed enough and this has nothing to do with the OPs questions about running wired ethernet through a home.