And can you imagine J.J. Abrams getting hold of the TARDIS? It'll come out the size of a double-wide mobile-home and the light on top will blind onlookers.
I think that's highly improbable. The TARDIS isn't supposed to look awe-inspiring like the Enterprise is.
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I agree that if Doctor Who were to become too popular, someone would try to Americanize it. And that'd be a shame -- it's a British icon and it should stay so.