Two weeks after posting the above, it looks like I will start to get my wish. Per today's Twilight Time thread, TT will release The Valachi Papers in June and another 70s Bronson film, 1973's The Stone Killer, in May...
The Man (1972) - starring James Earl Jones
I've never seen this but would like to, as it had a strong cast as well as a screenplay written by Rod Serling. Apparently it was intended to be a TV movie but ended up getting a theatrical release instead. From what I can tell, it's never been...
I agree with many of the choices listed in this thread. Let me add 2 more that I didn't see anyone mention:
The Runner Stumbles (1979) - Dick Van Dyke (There's only been a VHS release.)
Going In Style (1979) - George Burns & Art Carney (There's a DVD but no Blu-ray.)