The necro scythe is one of the coolest looking spammable-like abilities in the game in my opinion. And would fit necros (especially stam, cus melee range) as a main spammable or execute ability in my opinion. It is such a shame that it is used as a primary tank heal instead. If they could perhaps change this skill to be used more actively as a dd skill it would be really cool, and too be fair, it looks way more like a damage-skill, rather than a defensive skill. But obviously that means giving the necro tanks a replacement. The graverobber skill is completely gargabe, even after what they claim is the new and improved version. If they revamp this entirely into a new self heal/off balance skill (similar to how the current scythe works) i think it would be a great way to give the dds a use of this awesome looking ability, whilst also giving the graverobber a much greater use, in both pve/pvp.
If the scythe where to become an execute ability, i think the current crit execute passive should change aswell, since having 100% crit AND an execute would of course become very overpowered. But this also works well imo, since we have already seen that the devs want to change how the current crit situation is.