-1.
While realistic in approach, it would be horribly misused by people grouching about not being given a chk 6 etc. etc.
Plus, don't we already have enough gripes about the collision model? Although its the best solution that can be practically derived, people just don't want to get that through their thick noggins.
And lastly, it would make squad formation flying (if anyone ever does that) near impossible. In the good ole days (back when H2H was free) we had done some rather extensive testing and found variations as large as 800 yards between two friendlies in formation. You wouldn't want to see your squadmate who's 500 ahead of you suddenly go spiraling to his death because on his comp your prop mowed his tail off.
EDIT:
Quoting here:
Here is an animation someone (Lusche?) put together. It shows the film OVERLAPPED of a single collision, but the views are from the two different computers.

Best explanation ever! Cant get clearer than that!