If nothing else Articuno does have access to roar, so if Alakazam did go that way it would just end up taking more damage overall (not to mention that even at +2 Articuno still has a chance to break its subs). Roar/Roost/Sub/Ice Beam would do decent in the metagame from what I can see. Of course I haven't had the chance to actually go out and play the metagame yet so I am basing this off of what I have heard, and the damage calcs I have been able to run.
The SubRoost set is even able to mess with some of the physical attackers, being able to outspeed most of them, in particular Honchrow and hitting it with a SE STAB attack, without being OHKO'd by Honchrows strongest move.