re: Can this 747 take off?

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The wheels do not nor have they ever simply "free wheeled". There is a ton of friction from the load of the plane on them.

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You really want to argue that there is more friction than thrust?

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In regards to the 747 taking off without wheels rolling, lol. Okay

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You're just mad because it's true. Assuming nothing breaks, which is just as reasonable assumption as a magic conveyor belt, what would stop it?

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If you put a stroller on a conveyor in an airport it doesn't just sit there in place. It will move down the conveyor.

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OK. And you are standing beside the conveyor.

You put your hand on the stroller and press down (not forward).

How strong do you have to be to hold the stroller in place?
How strong do you have to be to roll the stroller 1 foot forward and 1 foot backwards while on the conveyer.

That is the definition of free wheeling.
The force to keep the object stationary on a treadmill/conveyor is negligible.
Now strap on 240,000 horsepower.
What effect does the conveyor have on the stroller/747 with that level of thrust?
If your hand can easily rock the stroller back and forth against the force of the moving sidewalk, what can a jet engine do thrusting the air in front and behind the plane?