I am not sure if this has been asked before (would make sense if it did) but what about dogfight maps?
It'd be very odd to just have a huge plain to fly over, but it would be a work of Hercules to make a map large enough to not constantly smash into a boundary with you plane/go away from everyone else.
Also, we have very well-built interior DM's (thank you Bushido) but most of the larger maps like Gcat's and Heed's styled maps would go away, or take ages to adapt.
I myself wouldn't really experience bother with this update, but I can imagine it to be a blow to the gunning-FPS part of this game.
Build it out of big bricks so it doesn't take so long to build? You don't need to make it be out of 1x1s if you're flying 100ft above it very fast. -- kompressor