Even standing on a treadmill with rollerblades on your feet, there will still be some backward force exerted on you. But, with a small push forward, that force can be easily overcome.

A plane would still be able to take off on a treadmill.

The debate and confusion on this issue comes from the wording of the question posed in the plane/treadmill scenario.

An even bigger question than whether the plane will take off is .... how come this is even being brought up again when the original thread is almost right beneath this new thread?