You forgot to add ... [people don't like change] for the worst. I love new, cutting edge stuff. If it's better and easier, I'll switch in a heartbeat. I'm primarily a Microsoft/PC user, but I love iOS because it's simple, elegant, thoughtfully designed, intuitive, fast and beautiful to look at. Win8 has none of those qualities. It's worse than Win7 in just about every way. Sure it may be a bit quicker and leaner under the hood, but those are about the only positives. Most things that took me 2 or 3 steps before now take 5 or 6 (how can that possibly result in equal or better productivity?). Many things are hidden, removed, oversimplified, inconsistent and look terrible. If they want to replace the Start menu with something better, I'm all for it. But they replaced it with something far worse. I'm repeating myself, but hiding and removing apps so they require a text search to run is unacceptable. Microsoft Bob was the future at one time, and you see how that turned out. Vista was another one that was supposed to be the future but sucked. People embraced Win 7 because it was far better than Vista, in spite of sharing a lot of similar elements.
Staying in the realm of AVS, current Harmony remote software is another example of bad ideas which aren't worthy of adoption. Logitech has done what Microsoft is doing with OS's. They put a lot of money and effort into a new interface that is absolutely terrible. It looks more "futuristic" I suppose. But half the functionality of the old software has been completely removed. The most frequent solution to problems posted in the logitech forums is to use the old software. Logitech suffered a big drop in sales and a lot of bad press as a result of their ineptitude. So just because something is new and different doesn't make it better.
In any case, Win8 likes/dislikes are being hashed out all over the web, so no need to repeat most of it here. Suffice to say, as an HTPC platform, Media Center hasn't changed a bit, and everything else is more difficult to find and use. That's not worth whatever small performance increases some may see IMO.
I don't usually like to make predictions, but I'm pretty confident Win8 will be a huge flop. Anyone considering it would be wise to take a wait and see approach.
If you like Win 8, that's great, enjoy it. But the vast majority of us don't, and for very good reasons other than resistance to change. If Win8 really is the future (which I highly doubt), then I don't mind staying in the past a while longer until I can switch to Linux or Mac.