With sitcoms revolving around families I can see where the writers can get stuck in coming up with a good series finale, they would usually have any of these scenarios:
- a wedding occurs
- a death occurs
- a graduation occurs
- a birth occurs
- mother/father get a job promotion in another city and have to leave town forcing entire family to move
There is no defining finite end to family sitcoms as these are normal everyday things that real families go through.
I think for Diff'rent Stokes since both Willis and Kimberly had left the nest and off to college and think the logical ending would have been for Arnold graduating HS and being accepted to a college therefore leaving home for good after a tearful goodbye to Drummond, Maggie and Sam
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