Simpsons have one issue they need to address, and they do sometimes: The lack of additional characters to play off of. Usually they fix it by having an outside player come in (monorail guy, homer's brother, homer's mother, etc), but they don't have enough people inside the show to make it work just like that. I would expect to see some new people in the neighborhood if things keep going just to add to the fun, or the development of characters not often seen (like the bullies famlies or the cops famliies / relations / etc).
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