Whilst I agree with that to an extent, IE still has a large majority share of the browser market, somewhere around 70% last time I checked. So, whilst Firefox is getting more juicy a target, it's still only around 15-20% so it's not anywhere near the target that IE is.
As a browser, IE also has activeX going against it in terms of security. It's also not very standards compliant compared to it's competition.
So, whilst it might not be the evil it once was, it's still a poor product compared to it's peers. A market in which the products are essentially free means that, objectively, there is little reason to "choose" IE8 over something else given that the something else is likely to be better in one way or another.