100% agree - I've worked in many buildings that have a UPS protected power supply running up from the computer room to comms rooms on each floor side by side with CAT5e cabling without any issues. CAT6 is not too much more but when you are wiring a 500 desk office with each desk having 4 network ports the difference soon mounts up.To me, for 10/100/1000 ethernet, S-UTP seems like overkill. In nearly 8 years, I've never yet had any problems running GBit ethernet over cat5/5e UTP. At work I have (literally) got thousands of UTP cables (cat5 and cat5e) some of which are over-length, run through electrically noisey spaces, along the same trunks as the mains, and all manner of other horrors and I've never had any problems with them. Dodgy termination in the plugs/faceplates is the biggest hassle.
And it takes a highly skilled moron to really screw it upSave your money, cat5e UTP will more more than good enough for GBit ethernet unless you do a spectacularly bad job of installing it.
What specific thing do you think he meant by this, as in what specifically might you be able to do with cat6 that you can't with cat5e in the next 15-20 years?