'The Big Bang Theory' should have ended with season 11, while there was still hope!
Big Bang Theory's latest premiere plummeted by at least 41 percent from its season 11 rating, which had opened to 14 million viewers and a 2.7 rating in the 18-49 demographic.

Off to a mellow start?
TV's beloved geekdom, Sheldon Cooper and Co are back for one final time on 'The Big Bang Theory', which premiered its twelfth and last season on Monday (September 24). Despite this being a wrap-up for the CBS sitcom, though, TBBT failed to garner a high viewership, taking a massive tumble in Monday night's TV ratings.
According to reports, the Big Bang Theory's latest premiere plummeted by at least 41 percent from its season 11 rating, which had opened to 14 million viewers and a 2.7 rating in the 18-49 demographic. Meaning, this year's premiere averaged only a mere 12.7 million live viewers - although significantly higher as compared to other TV shows - along with a 2.4 demo rating.