If DALLAS
had to end with "Conundrum," then once JR appears to shoot himself, the camera ripples, blurs and fades into the same old footage from five years earlier when Pam wakes up and hears someone in her shower, goes to open the shower door, sees only a pink tile wall, and the camera pans down to see Mark Graison lying dead on the floor of that shower --- Pam sees it, screams,
"Maaaaaaaaaarkk!!" in heavy reverb, and the camera moves in on the drain, fade to black.
Series over.
At least it allows the remaining ambivalence over the 1986 dream scenario to be briefly revisited, permitting the viewers to renegotiate whether the later seasons ever actually happened.
Sure, we can't undo Donna Reed, but I guess that's what the
It's a Wonderful Life theme of "Conundrum" was all about.