You are missing the point- jump infantry, jet bikes, and skimmers can fly OVER their opponents. It doesn't matter that there are opponents right on the board edge.
Also, it has been mentioned before. If you are already within 1" of the enemy, you can move away! You are not in a perpetual state of non movement.
Furthermore, the edge of the board is the 'abyss'. Nothing exists out there... You have to start measurement in the reference frame of the board. The only way to do that would be to start from the board edge...