I am a big fan of both films, and have over many years come to the firm conclusion that, while
2010: The Year We Make Contact could never live up to its best-films-of-all-time predecessor, it’s both a terrific film on its own merits and could be tweaked even today to be better.
What it needs, fundamentally, is the Blade Runner treatment: Kill the expository voiceover, tighten up the edit, make the ending less sentimental and more mysterious.