Yeah, SCH would be easy to split off into its own thing, and just give anyone that has arcanist levels above 30 when the change hits get those level in SCH too so nobody has to relevel, and it would work. And hey maybe they can take that chance to give SMN a worthwhile physick. (Why not, we have clemency and vercure in the game.) Or replace it with something else.
The SMN/SCH fit always felt al ittle odd to me. Gameplay wise, SMN feels more natural of course because it stays as dps and doesn't have the sudden shift toward healing. Story wise though, the Nymian Marines and the focus on strategy etc always felt like a more natural extension of the arcanist storyline than SMN did.