It was mind boggling to them that the producers only wanted to do three seasons
Maybe he thought he couldn't have gotten away with dancing around the resolution for 10 seasons?
Seems like there's a gap there.
If you make a show that people will mindlessly put on for hundreds of hours, that's still worth an utterly insane amount of money for a very long time.
It's a side effect of the weird way TV show syndication contracts (used to) work. Basically for various historic reasons you could charge cable networks more for showing re runs of shows with over 100 episodes than you could shows with less than 100 episodes.
So it often made long tern economic sense to push your show over that 100 episode line even if the last season or two where terrible and got terrible ratings on initial airing.
en.wikipedia.org/wiki/100_episodes
Like Two and a Half Men and The Big Bang Theory are shows that should've gone past their 8th season. The Office should've never had those abysmal last two-three seasons. That '70s show should've never had those abysmal last three seasons.
I always like it when creators and producers recognize when a show has run its course. This is why we have good memories of Seinfeld. Jerry Seinfeld stood to make something crazy like 5 million per episode if they had done a 10th season but he knew the show had run its course and ended it on a high note (something, btw, that was a plot point on an earlier episode).
Same with Breaking Bad, they knew that they had a story to tell and that it didn't need to drag on and they delivered some of the finest 5 seasons of television drama that one could ever ask for.