I’m assuming Peter L. thought about a possible spinoff over the last 10 seasons. But it appears it was decided that wasn’t going to be as successful as the original & not followed through on. And the show wasn’t canceled (I really wish people would stop saying that—a show going off the air doesn’t always mean it got canceled). If it were canceled, CBS wouldn’t have said all the glowing things it did about the show in the statement about the show ending; also, it still had ratings good enough to remain on the schedule for next season.
The show actually apparently ended because Alex & Scott’s contracts were up at the end of the current season, & neither chose to renew them. Alex because of lingering injuries, including bad discs in his neck & back among them, & he still wanted to have some mobility left to be able to do physical things with his sons, stepson, & eventual grandkids (Alex has an adult age son, & his stepson & other son are both minors). Scott, presumably, didn’t renew because he was tired of doing the same thing for 10 years. I should also add Alex was a credited Producer on this season of the show & he may have had some say on when to end the show because of that.
Anyway, getting back to “Canceled vs. Ended” regarding TV series. A good way to look at this is, if your show gets canceled that’s basically like saying you got fired from your job. If your show merely ends, that’s basically the same thing as if you quit your job.