For the hatrick, same parameters, chances on:
Chico and the Man
New Dick Van Dyke Show
I would purchase Carter Country. There was one episode there thad had me in stitches.
Room 222: I've been round the bend over this show many, many times and my original assessment still stands. Unless Fox goes back to the original film elements, does a major restoration and all new transfers, this show is dead and buried. If that is done, then the only way to erase the bad taste left from the season 1 & 2 releases is to do a complete series set. Other than that, I do not believe this show stands any chance of ever getting finished.
Knots Landing had one show air in the 70's, December 27, 1979, so it would technically be an 80's show.
One more '70s show for the "highly unlikely, but man I'd love to see it again" category:
How about The Flip Wilson Show? I could easily see Time-Life doing that since it's also syndicated in reruns by the same people who distribute Laugh-In.