just because there is no modern 21st century cg, does not make it a bad film.
If they ever add cg to wrath of Khan, it would be as rediculous as the star wars special editions with effects from 2 time different time periods.
Re-do's of effects on classic sci-fi films never work and should not be done unless the movie sucks so bad it would definetely need it. Like Star trek V for example, that could defintely use some new effects.
I hate how fake all of todays films look, how horribly overblown all the cgi effects are in them.
worst offenders:
peter jackson's king kong
star wars prequel trilogy
Lord of the rings trilogy
Star wars 2004 and 1997 Lucasized cg crapped on versions