I think a lot of the draw of destruction for me was always that it was a spec about careful planning and managing slow building / really limited resources which set it apart from something like a fire mage which is more reactionary and proc oriented. Which is something to be very wary of as destro is always accused of being a watered down fire mage or fire mage lite. The last thing we'd want to do is push the spec towards playing more like fire.
What they did to a lot of the specs mechanics in legion (and are continuing in BFA) has taken a lot of that game play away, but that's what I'd like to see from the spec. Something more mindful, as opposed to reactionary.