Read an interesting article in New Scientist this week, about the possibility that pilots would prefer to be able to calculate their own flight-path and not be bound by atc, except during approach. Seems there are quite a few adherents to this philosophy and there may be a strong case for implementing it. It's been tried already in a few areas. It's thought it would actually reduce the chances of near-misses, or actual (as in Switzerland the other week) collisions.
Seems to me that MS FS2k2 got there first!!