Wool absolutely has a place in the backcountry. Synthetics have there place (especially for things like baselayers and waterproof outer shells), but in the winter one of the primary advantages of wool is that it still keeps you warm when wet, and will not catch fire from embers. This means that when it is really cold you can get really close to your fire and not worry about your clothing melting on you or catching fire.

The only thing I don't like about wool is that it tends to be bulky and take up a lot of room in a pack, while synthetics usually pack better.

Wool is awesome, especially if you get into some of the more exotics, like alpaca or quivit. They are both super warm(much more than sheeps wool) and almost waterproof.

With wool, I (ok, mostly my wife) can knit just about any type of clothing we want. Hard to do that with synthetics.

I wear wool shirts most of the winter, and my hunting clothing is all wool as well.

Greg