Keep Circulating the Tapes: Typical for a Wolpert show- CBS themselves would likely own the rights now (original co-producer Taft Entertainment Television having been absorbed into Worldvision Enterprises, which was merged into Paramount Television in 1999, which in turn CBS took with them during the CBS/Viacom split of 2005), but they haven't done anything with them.
Screwed by the Network: More like outside influences (though there's a rumor going around that CBS set up Blackout to take the fall for cancelling Pyramid so they could get both out of the way to air Family Feud).
For the video game:
Feelies: There is a tie-in prequel novel available with the game.
