regarding rogues:
I did my math with new katana skill and katana weapon. using the new skill every 4 seconds for double hits will result in overall dmg loss for single target. I think I don't need to mention, that every AOE on every rogue combo will result in dmg loss, bcs the katana have less dps
In summary: Overall less dmg in single and AOE. Seems a good solution for mdps and chain classes