Is there a trend to remake movies in 3D? Is this the same as colorizing? Or are there more financial motivations: we shouldn't expect Casablanca 3D before they make Gone with the Wind 3D, The Sound of Music 3D, Birth of a Nation 3D, Jaws 3D (Hey!)...

As Orwell might have said, in 1984 3D,

if you want a picture of the movies of the future, imagine a ball bouncing on a wooden stick &emdash; forever

Given The Third Man was successful enough to inspire a toy, I would not be surprised to see that. In fact, The Third D Man might actually work, so long as they reserve the 3D effect for just the scenes in the sewers.

But I think we should fall back to the axiom that "dimensions should not be multiplied unnecessarily". Sometimes 0D is enough.