When it _is_ stalled the A320 just keeps the THS where it got to, if it motored to neutral it could help a lot. Unless you can think of a reason after the stall why the THS should stay nose up at all
How do you definitively define "it is stalled"? To a high enough degree of integrity you can remove pitch control from the pilot?
When the stall warning sounds?
i.e., if the stall warning goes off, THS must automatically roll forward to at least neutral asap (or go nose-down if you -- controversially -- want to simulate a stick-pusher)
Of course, this should be something not needed to be left to automation