In the PUGs I've played post-patch, all this has done is create the illusion that you have access to the whole map. The reality is that the group still finds some place to hole up and now typically has 2 choke points to hold instead of the 1 from the font room. Alternatively, sometimes you get that one person who just sits at the flag area, regardless of how open it is, and promptly gets crushed by ranged fire.
If the devs really wanted to encourage movement on the battlefield, there has to be a reason to do it. Some brainstormed possible ways to encourage movement?
1) Foes spawn in mobs instead of 1 at a time at various points on the map.
2) Introduce a tossed resurrection potion (or repurpose healing mist to do the same?) or a class with a resurrection spell so that people can be picked up on the run so that it's less risky for individuals to range farther from the main fight
3) Better targeting by the foes so that when a person does dust, they don't camp so long on the corpse
4) Make mobility abilities useful (leap, combat roll, etc.) so that not only does it get the character out of the way, but also breaks the targeting on the character so that the foe is forced to switch to a new target
5) Doors - Add doors to the map. Make them closeable, but only for a short period before they open and then require a cooldown to close again or make them destroyable so foes can get through them and render them unusable. Just something to buy a couple seconds to fall back or move.
Some ideas better than others, but as it stands, all this has done is create the illusion of choice and frustrated more inexperienced/novice players that don't have good gear to save them from tactical mistakes. (I am a mediocre player who has put in enough hours to get gear that forgives a multitude of tactical sins.)