There are few problems.
1: many on screen would cause MAJOR lag, as well as remembering every single location a player crashed, especially when u think about it in the MA like 100,000 people crash a day!!
2: Object limit, I dunno bout the language they are using, but allmost every language has an object number limit, usuelly some crazy number like 832975820, but with as many bad (and good!) pilots in AH it could still go over, allso u must concider all the trees and other objects, I dunno how HTC does those, they may reuse same object numbers as I am doing in my game

which is a possibility, but then the long code to calculate the distances, see what objects are free, etc. would prolly cause lag (thats prolly what they do with trees?) anyway, I'm sure HTC would'nt even have to think for 2 secs how to do this i'm more thinking out loud about my games LOL
But as with anything it'd prolly cause a lotta lag.
I like great graphics and all, but I believe gameplay should allways go before graphics (unlike most games today

).
But if they could do it lag free (or simi lag free) it would be GREAT!!!