Tonight, Numb3rs finishes off its sixth season with episode 118, “Cause and Effect.” Will the show be back next season? A decision hasn’t been made yet but lots of people are betting that it will be cancelled.

Numb3rs follows FBI Agent Don Eppes (Rob Morrow) and his genius brother, Charlie (David Krumholtz), who helps the authorities solve cases with mathematics. The cast also features Judd Hirsch (as their father), Alimi Ballard, Dylan Bruno, Navi Rawat, Aya Sumika, and Peter MacNicol.

The series debuted in January 2005 and has long been a successful player for CBS on Friday nights. In season one, Numb3rs averaged a 3.2 rating in the 18-49 demographic and about 11.1 million viewers. They went up in season two, with an average of a 3.3 rating and 11.7 million viewers. Viewership has fallen since then however and last season, Numb3rs scored a 2.2 and 10.2 million.

This season, Numb3rs’ ratings have dropped further still — averaging a 1.8 rating and 8.26 million viewers each week. As a result of the decline in ratings, CBS (which is having a very good season) decided to cut back on the number of episodes and reduced their season order from 22 to 16 installments.

Would you watch season seven of Numb3rs? Yes! Absolutely! Maybe. It's an okay show. Nah, not my thing. View Results  Loading ...

The official reason for the decrease is that CBS had too much programming and needed space to try out new series. Next week, Numb3rs’ timeslot will be occupied by a new show, Miami Medical.

CBS has maintained that the fate of Numb3rs hasn’t been decided yet but, considering the series’ production costs and ratings, it seems fairly certain that the show is done.

In fact, ABC and FOX are betting on it. The networks have already cast Morrow and Krumholtz in new pilots.

Morrow will star in a dramatic pilot called The Whole Truth for ABC, opposite Joely Richardson. He’ll play a fiercely competitive and successful defense attorney who is close friends with his equally talented courtroom adversary (Richardson). Whole Truth is being produced by Jerry Bruckheimer.

Meanwhile, Krumholtz has been cast in a comedy pilot for FOX called Tax Man. The project’s being produced by Ron Howard and stars Krumholtz as an IRS Agent who’s trying to find nobility in his work. Judy Greer recently joined the cast.

If CBS does decide to bring Numb3rs back for another season, both Morrow and Krumholtz will be obligated to return. However, the other networks wouldn’t cast them in new pilots unless they felt it was a very strong possibility that Numb3rs would indeed be cancelled.

What do you think? Would you like to see Numb3rs return for a seventh season or is it time to say goodbye to the Eppes?

Image courtesy CBS.