There would be no need. The motion pictures were mastered in 35mm; the only reason they're recompositing Star Trek: The Next Generation is because it was mastered on video.
It would be nice if they would give the movies a proper remaster, though.
The movies could benefit from recompositing too, especially The Motion Picture. Imagine that scene where the Big E orbits earth as the sun rises without matte lines. Gorgeous.
"Imagine" is the key word here. CBS is investing in TNG because they want to be able to continue selling it to television, which requires it to be in HD. Paramount (which owns the features) has no interest in re-compositing the effects in the movies; they are already being sold to television in HD.
It would be nice, but it's not going to happen.