Could "Growing Pains' have realistically run a few more seasons?
I've heard the suggestion that Kirk Cameron was more or less, the primary reason why Growing Pains ended after seven seasons in 1992. I think that everybody by now knows, that after he became a Born-Again Christian, he became incredibly difficult and uncompressing/uncooperative on set.
He got his on-screen girlfriend Julie McCollough fired because she was featured in Playboy, despite not even appearing topless at all. He also got Matthew Perry fired for being an "Agent of Satan".
He apparently even tried to pull the same stunt with the show's executive producers because he didn't agree to what he considered a vulgar joke. Since the executives refused to change the joke, Kirk tried to go over their heads and directly contacted then-CEO of ABC Bob Iger in order to force their hand, even calling the executive producers "Pornographers".
Ultimately, having to deal with his unreasonable demands and his forcing out other actors for not going his way, the executive producers decided that enough was enough. If you notice, in the last season, Dan Wilcox is listed as the executive producer instead of Mike Sullivan, Steve Marshall, and Dan Guntzelman.