Currently, there will be nothing done against using this feature, but this decision may change, once the game is no longer solely offline.
Here a decently recent post by Sarno
Devs definitely don’t want players to do this and they already did change some skills (most notably Flame Ward to be more situational and not a auto-cast ability).
I am sure skills like Maelstrom and Devouring Orb will most likely be address in terms of their skill tree/base functionality to just make using auto-cast be “weaker” or not using it’s full potetnial, similar to Flame Ward.