I think we have two arguments going on here.
The people saying that everyone here are idiots are looking at it one way, while others who say it won't take off are looking at it another way.
Squeak, tama, njizzum, etc. are looking at it like this: The plane is able to move forward on the treadmill because the wheels aren't driven. The plane can move forward relative to the GROUND, generate enough air speed (and thus lift) and take off. This is pretty obvious.
Others in this thread are looking at it like this: The plane is completely stationary relative to the ground. The treadmill is moving at 150 mph backwards and the plane is only throttled up enough to keep the plane in the same position relative to the ground. Thus, no air speed (and no lift) is generated.
Bottom line is that we'll have to wait until the episode to see EXACTLY what they are trying to prove here.