What happened to Mark and David?
I know Mark cannot come back because Glenn Quinn is dead and that Becky's son Mark is an homage to him but what about David?
I understand The Big Bang Theory has him tied up for shooting schedules but Chuck Lorre has been executive producer on both shows and enjoys a good crossover storyline when he can get one. A reasonable Sara Gilbert/Johnny Galecki subplot with a touch of Laurie Metcalf thrown in for good measure could muster a gag or two.
#Roseanne Barr 2020!