Collision Detection = Better PvP!

I've been playing graphical MMOs since Ultima Online's release in 1997, and the one feature I miss the most, other than housing, is the collision detection.

If you've never heard the term, or don't know what it means, let me quote Wikipedia...

(http://en.wikipedia.org/wiki/Collision_detection)

"In physical simulations, video games and computational geometry, collision detection involves algorithms for checking for collision, i.e. intersection, of two given solids. Simulating what happens once a collision is detected is sometimes referred to as "collision response", for which see physics engine and ragdoll physics. Collision detection algorithms are a basic component of 3D video games. Without them, characters could go through walls and other obstacles."

The collision that I'm referring to from Ultima Online is between two players. If you've ever played WoW, or a similar MMO, then you know when two characters collide they walked through each other. This is great in a candy-coated world of non-realism, but the strategy & tactics available in PvP from this feature are endless!

The melee characters would be given new roles, landscapes could be put to use, no longer would you be able to train DPS on a healer before killing his tank standing in the doorway blocking your path.

I remember my first strategical PvP encounter in Ultima Online that revolved around collision detection. A couple of friends and I were getting mauled by more experienced players outside of the Britania Bank. I decided to barricade the room inside the bank with our Mace / Shield user blocking the door and the other two of us, archers, would stand behind him and cross heal with bandages. We held our ground firm and were unable to be killed. We even took a few people out, and it wasn't until we broke formation to go loot that we all died.

This is just an example of how landscape, formation, and strategy can add a whole new level to PvP. It's because of this that rooftop camping should not have been banned, instead they should have made rooftops easier to access for guards and other players!

Now before the comment is placed, I'll address the main concern now. I'm sure you're wondering about the grieving nature of not being able to walk through players. What if you get pinned in? Well there would be spells, abilities, and items to get out of that situation, but they would only take you so far, so there would still be occasional case of getting circled.

Would you like to see something of this nature in WoW, and if so, which zone in do you think would make the most use out of collision detection in PvP?