Out of all the remaining known archetypes from WC3, spellbreaker is probably the only one left that has no presence in the game.
There are a few problems with adding this into the game however. Its going to be yet another elven specific class that doesn’t really have easy ways to path out its different specs, since its really a single minded style.
This doesn’t mean there is no way to add it into the game. It could be a 3rd spec for demon hunters. It gets rid of adding yet another elven specific class into the game by adding it to the already elven specific class. Also it fits well with demon hunter’s anti magic theme. Lorewise however, its going to need some additions as to how this came to be, but it shouldn’t be that hard.
The theme of the spec would be a mid-range dps spec, that focuses on breaking magical buffs and effects in general and can build on demon hunter’s anti mana/magic pvp talents to establish them as their own spec, rather than adding them to havoc overall, which helps havoc to build its own identity better as well.