This is quite literally one of the things I am referring too. There are a lot of players who just lack the experience in arena's to even want to que ranked after they are fully geared. Or they que once and never que again because their only experience arena's was ranked and they got blown up, globaled, snare/cc locked, and felt like they provided little to no help to their team. Because arena's are played out so vastly different then your standard objective based warzone.
In addition to everything I've stated it'd speed up late night/low population que's and provoke more activity at otherwise less active times of the day.