Amazing how well TBBT has evolved. Despite the appropriateness of that to the show's theme, it was far from a certain outcome. I remember starting to tire of it, not a lot, but some, before Penny's posse not only formed, but rose in prominence. It was a much needed influx of new chemistry. Normally at season 12 of something, even if I were still watching, I'd be thinking it's about time to open that timeslot up to something fresher. Another 2 years would have been easily and well filled (what they were negotiating for IIRC). What's TBBT's 30 minutes going to be filled with? A dozen sitcoms with a cancellation threat hanging over every second of even their first episode, I assume, the threat being carried out on the best before their first full order is filled. Yay.