Can't see any reason to move to it from a business perspective for a loooong time, unless there is specific functionality that only windows 8 provides needed.
Windows 7 is supported for many years yet.
End of support for mainstream Win 7 is less than a year away. For those with extended support it is 2020. Windows 9 is out next year. Not all business have access to extended support so end of life support for some companies is January next year. If that is the case, moving to 8 may be the best option.
Whilst I agree that from a technical perspective a move to 7 from XP would be easier as it's been done many times compared to Win 8, for companies that haven't done so yet and have extended support there are other reasons to consider 8, even though the costs would be higher.
If you are a large company with an aversion to change and haven't moved from XP, Win 7 would need to start to be replaced in 5 years. If you go to Win 8, it would probably 7 or 8 years before a change is required. Some companies would find that attractive.
One of the complaints that some users on XP complain about is that IT is old, so finishing rolling out 7 when 9 is due out soon wouldn't go down well with them.
People are finding increasing uses for tablets and touch screens. These are best on Win 8, so by using Win 8 on desktops and laptops as well there is only one OS to maintain.
I've not come across any features which would justify a move to Win 8 by itself, but in our environment Branchprinting could prove useful.
I think anybody still on XP should weigh up the pros and cons and then make an informed choice as to what is best for them.