With enough reductions on equipment, along with the right spec, you could actually make cluster arrow work - it's a powerful skill, it just costs a lot. However such a thing would be really niche, especially at this point in time.
I'd expect to see more experimental builds like that later on in the lifecycle of the game as people get bored of using the same old tried and true specs, and the gear is out there to make it work.
I'm still kind of baffled by Smoke Screen though. Even after the nerf, it's still invaluable, and I would be surprised to see a DH going without it on Hell or at least Inferno. Invulnerability + CC break is too good (I can understand why it was nerfed - it's still a top tier skill even with a 50% duration reduction). Maybe if Vault broke CC as well.