Thanks OP for bringing up this topic into discussion because I'm also having trouble deciding which route I should be taking.
Personally, I think a players decision on whether they should use a skorn or be dual wielding depends on many things. Such as their gear, their build and what their intentions are, that is if they want to farm for xp and items or keys. I will use my barb as an example of what a person that wants to maximize both loot opportunity and xp gain would look like.
Edit: I can't post URL's yet but if you search Zeto#1125 on the diablo site then you could find me.
At the moment, I farm MP2 because as I've said, I want to both gain a good amount of xp in a short amount of time and get a better chance at good loot (hence why I don't do MP1 instead). Now, as to the reason why I choose to farm MP2 as oppose to MP3 or higher, with my current gear and build, I can basically oneshot white mobs with WW in MP2 thus allowing me to continue on the move. For my playstyle, a person who likes to be constantly on the move, I don't like having to backtrack just to kill a mob with a low hp bar. Which, is something I find myself having to do in MP3 since the mobs have more hp and I can't oneshot them like in MP2. And, correct me if I'm wrong, but if a mob doesn't die you get neither xp or loot.
Now back onto the topic of whether you should be using a skorn or be dual wielding. I agree that dual wielding may be the way to go. While with my gear and build I've completely eliminated the idea of "being fury-starved", I think the majority of players will have that problem of not having enough fury because a skorn is so slow. And from that slowness, several other problems may arise, such as losing survivability because LoH or LS isn't as effective. Sure for my intentions this isn't a huge problem because MP2 is fairly easy, but if I were to farm say MP5, I'd get put in my place fairly quickly.
So ultimately, I think that if say you had 500m (just to throw a number out there) to spend on weapons, buying two good weapons for dual wielding is the better option than buying one good LS skorn, since you can stay alive better, have a better fury gen and keep WoTB up.