In general I would not be surprised if in 6.0 the arcanist branches are changed so SCH or SMN just becomes its own job or something that you can pick up without any requirements, and if Arcanist is still around they will hone it down more on healer or DPS. Every patch they move them further and further apart as it is so they may be content to just allow this anomaly to remain. New expansions are a great chance to make sweeping changes.