because a wheel is a mechanical moving part it creates friction when it rotates. Some people think that the friction generated is enough to keep the plane from accelerating to a point where it has enough airspeed to generate enough lift to get airborne. Some people are also interpereting the question wrong. they think that the speed of the belt is linked to the rotatinal speed of the wheel, and that the belt and the wheel will keep increasing in speed and never stop increasing in speed. because the wheel is, in this scenario, going extremly fast, they think that there is again, enough friction to keep the plane from accelerating. Of course that interpretation is wrong, the speed of the belt is linked to the speed of the airplane. This will cause the wheels to rotate at double their normal speed, which can easily be proven with math.(but I wont get into it because its already been proven in this thread) However even with the increased speed of the wheel, the friction is still not enough to keep the plane from taking off.