Its extremely doubtful that Vectorization is ever going to be accurate to what the artists intends. I know this, because Im artist. Its not hard to see into the future, when you realize what the realities of the situation are.
Its one thing to vectorize something, and quite another to make an interpretive vectorization.. such as adding blended shading, and line alterations. (jagged edge -vs- smoothed)
How is a vector program going to realize that an object is supposed to be 'rough', such as a rock? By mere color? Sorry, no dice. Only a human is going to be able to decipher an artists intentions in a fast and effective manor. Even many humans who are not artists have trouble with figuring out shading, coloring, and line work.
You would have to have a PC capable of deciphering game objects, such as understanding the object was a Turtle for example, then figuring out the positioning, comparing it against a 3d model of a turtle, checking the lighting and nearby objects, comparing the artists shading with the 3d shading... and trying to figure out artistic liberties and changes, without distortions to the artists intentions.
And thats just the tip of the iceburg!
What about objects of fantasy? Odd shaped space ships? Alien plantlife?
I could go on and on for pages about these things.
Point being, is that it will never be acceptably correct in your lifetime, let alone a few generations down the road. Only when PCs are near 'Skynet' level of Artificial Intelligent... might you even have a glimpse of hope for it to work as intended.