Steve Carell as Michael Scott in The Office.

Now hiring ... Steve Carell has left the role of Michael Scott in The Office.

The folks at Dunder Mifflin didn't realise how attached they were to Michael Scott until they were about to lose him. Better the crazy boss you know than the potentially crazy boss you don't know.

Fans of The Office may be in the same position. Now that Steve Carell has left the building after seven seasons as the "World's Best Boss", it's hard to imagine anyone else in the job.

Or is it?

Does Catherine Tate have management potential?

Does Catherine Tate have management potential?

Carell's last episode aired in the US last week, running 50 minutes as Michael plans private goodbyes to his co-workers. His successor will be revealed May 19 in the season finale, packed with guest stars including Ricky Gervais (creator of The Office and star of the British version), Will Arnett (Arrested Development), James Spader (Boston Legal) and Ray Romano (Everybody Loves Raymond), plus Will Ferrell, introduced last week, and British comic actress Catherine Tate.

Buzz is that the replacement boss will be seen in the season finale. But does that mean it's one of these people? Or will someone from the inside - Jim (John Krasinski), maybe, or Darryl (Craig Robinson) - get the big promotion?

You can be sure producers have weighed their options with utmost care. Nobody, least of all NBC, wants to hurt the network's highest-rated Thursday comedy, one that's already been picked up for fall.

The loss of a star can revitalise a show (Shelley Long's exit did that for Cheers) or kill it (The X-Files should have called it quits when David Duchovny left).

In real life, people leave jobs and neighbourhoods all the time. On TV, though, we get so attached to favourite characters that an exit can be upsetting, even if it shouldn't make a difference.

CSI, a show about a team of forensics investigators, is hardly a character-driven show, but William Petersen's departure from the role of Gil Grissom sapped the series of its heart. And Scrubs shouldn't even have tried to continue with an entirely new cast.

But 8 Simple Rules kept going, eventually running three seasons after the death of star John Ritter three episodes into Season 2. Spin City lasted two seasons after Michael J Fox reduced his role and then departed altogether.

The Office, like Cheers, is an ensemble show that at best is more than the sum of its parts. And the series has already reinvented itself once, with unusual success, in the move to America from England and to Carell from Gervais.

There's no reason to think a new boss, if wisely chosen, won't fit in fine.

On the other hand: How does a sitcom replace a brother?

Sure, Samantha got a new husband on Bewitched without much problem, and the Cunninghams of Happy Days sent son Chuck off to - wherever.

But Charlie Sheen, fired from Two and a Half Men for his behaviour problems, was both the star of the show and the inspiration for his character, who often seemed to be mirroring Sheen's own life.

Just as The Office is one of NBC's few bright spots, Two and a Half Men is a powerhouse in CBS' lineup, even in repeats. The network renewed the series in 2009 for three additional seasons, with one more to go.

The core of Men is also a family - two brothers (Sheen and Jon Cryer), one brother's son (Angus T Jones) and a mother/grandmother (Holland Taylor). It's not as if producer Chuck Lorre can recast the role of Charlie.

Or can he? The result could certainly be hilarious.

Two and a Half Men actually has more options than The Office. Lorre could simply kill the Charlie Harper character, have him disappear in Africa, or send him on a round-the-world sailing voyage from which he's never able to Skype.

Then, the show could go on with the rest of the ensemble intact, perhaps with the unexpected arrival of Charlie's previously unknown 20-something son, played by Zac Efron.

As for The Office, my money is on wild card Tate as the new boss. She's smart-funny (look her up on YouTube), a sketch-comedy veteran who had her own Catherine Tate Show in Britain. To show her versatility, she played a Doctor Who companion.

Maybe Tate, whose character's name is Nellie Bertram, once worked for Wernham Hogg Paper Co. in England, where her boss was Gervais' David Brent. Maybe she hasn't been quite the same since.

That could make her just the boss The Office needs. Or if not, there's still an opening at Two and a Half Men.