Look, it's about ratings/money. Bottom line. Things have changed. If networks were axing shows like they do now back when Seinfeld and Friends were on, they would have been axed in the first season.
If you're asking for personal reasons like Jimmy is cute (I told him he looks like a younger, cuter George Clooney and he acted like he'd never heard it before, did I mention humble and sweet?) then I really can't give you a good answer. But if you have a serious interest in the networks and how and why they make the decisions they do, then I suggest you seek out mentors in that area.
I also get a lot of "political" insight from my writer friends, but it's different for every show.
For more tips and articles by top entertainment industry career coach, The Greenlight Coach, visitwww.TheGreenlightCoachBlog.com
To stay current on The Greenlight Coach's speaking engagements, recommendations, and work success articles, sign up for her free newsletter at the top of the page and get a great bonus 1-hour MP3 on creating powerful business partnerships when you do!