Yeah, that's why the painting itself should also be preserved independently of the movie, maybe as an extra on the BD, like the SW mattes.
Plus I don't really see anything wrong with the way it looks in the original movie - I've seen far worse matte-painting composites.
Plus it's not a great matte-painting to begin with - the background has a bit of a pencil-sketch feel to it - a bit of blur actually help it look more realistic.