Don't do it Ricky. Please. The hottest rumour on the blogsophere is that there is going to be another episode of Extras. Hurrah, and also, oh no. Apparently Ricky Gervais has said he'd like to write an episode following actor Andy Millman's adventures in Hollywood.

Now I was under the impression that Gervais had said that he wanted to wrap up Extras after two series and the Christmas special in the same way that he wrapped up The Office. Leave 'em wanting more. Or, as he put it to me when I interviewed him during the success of The Office many years ago, don't milk a sitcom dry. Gervais told me he had seen too many of his favourite comedies go on long after the laughs had run out. He always used to cite Fawlty Towers as a classic example of a series that bowed out at the top. Reading back over old features on Gervais, however, I now notice ominously that the 2007 one-off Extras Christmas special was described as a "series finale", rather than a final-ever episode.

It is always a perilous business bringing something back. The Legacy of Reginald Perrin – minus the dead Leonard Rossiter – rather stomped on the reputation of the classic series – with the living Leonard Rossiter. To The Manor Born did itself no favours by returning for a one-off last Christmas.

And if Gervais is reviving Extras Gervais should maybe pay special heed to the risks of shows with celebs. The formidable Blackadder gold standard was undermined by the Millennium special with everyone from Kate Moss to Colin Firth popping up in it. These revivals are always a bit icky. It feels a bit like EastEnders bringing Dirty Den back from the dead whenever the ratings are flagging.

Extras was brilliant – particularly in the last episode when it put the boot into reality TV. But there is usually a natural time to stop and driving off into the sunset in Maggie's battered old 2CV was probably it. I thought that meant Andy Millman was rejecting the notion of stardom. The thought that he was actually driving towards Sunset Boulevard fills me with a little bit of sadness.

Then again, if there is a chance of seeing Andy Millman acting alongside Al Pacino, who can blame Gervais for being seduced? He is certainly big enough to get real stars rather than the likes of Kerry Katona. An open request to Ricky – who I'm sure reads this blog avidly – if you do do another Extras, just don't screw it up, otherwise in twenty years time another sitcom writer will be saying comedians should quit while they are ahead, not like that Ricky Gervais. Oh, and if you do do another Extras, can I have a part please?