BBC Breakfast

Why?

Both teams present three days each - I don't see what the difference is anymore.

It's not me you need to lecture.Just because you don't see the difference doesn't mean there isn't any.
It's the BBC (on various platforms) and Susanna herself that have been calling her the main presenter for the last 2 years. I couldn't care less.

I'm not lecturing anyone - I merely queried your assertion.

I don't see the need for that tone.

Most of the references to "main" presenters have either been here or in the press.

Frankly, as I posted above, the concept is somewhat moot now that both teams do three days each, with Sunday being the poor relation.

BBC World News is starting to feel the pressure on the on screen staffing, with Mishal Hussein on Radio 4, Martine Dennis now with AJE and the sad passing of Komal Dumor, Naga is probably more needed in BH then Salford.

I didn't say ITV keeps everyone on - and IIRC it was Grainne Seoige decision not to continue at Daybreak, while Penny was offered Tasmin's position on Daybreak and turned it down. My point is rather if Susanna doesn't see her long-term future on morning television, she's as likely (if not more likely) to find a next position at ITV as she is the BBC. It is clearly a big risk moving to Daybreak, but not necessarily a bigger risk than quitting Breakfast three years without another pay cheque in position.

Re: overstating, Sian effectively replaced Kate Silverton on the nationals when she left Breakfast, on the News at One and weekend bulletins. This happily coincided with Kate returning from maternity leave to prt time work, and Sian subsequently went on leave, but in the long run it leaves the BBC with two high profile, experienced newsreaders with few regular shifts to share. Huw, Fiona, George and Sophie all seemingly remaining in their current positions for some time to come and therefore no network positions likely opening up that effectively leaves the network with more presenters than they need. That's not to say it leaves them with too high salary demands, nor tensions amongst colleagues, but it does prevent opportunities arising for Williams and Silverton, the NC presenters, correspondents etc.

By comparison Breakfast uses more low-profile presenters - Sally and Naga are now fairly familiar to viewers, but their other cover presenters are generally of a lower profile (Sian Lloyd, Roger Johnson etc.). When there are more senior presenters on the nationals than are needed, fewer on Breakfast and fewer on BBC World News, moving Naga to Breakfast might not fit with a greater overall strategy.

That might be different if Sian doesn't return to BBC News though. It might be she's allowed to film unaired pilots for other broadcasters without ending her BBC News contract, but I can't think of any BBC newsreaders presenting programming for other broadcasters?

Several presenters do other things elsewhere
Martine Croxall did a series for green.tv and Gavin Grey works for many other broadcasters. Babita Sharma presented UK 360 on the community channel etc..

http://green.tv/videos/extreme-weather-episode-1-2/
http://youtu.be/UsV2dLOc1Jc?t=2m7s
http://www.communitychannel.org/video/xnvBwmEUrLY/uk360_episode_32_babita_sharma/

You do realise that Sophie's first main national presenting gig was on Breakfast (News as it was then) back in the late 1990s? She left in 2002 to move on to bigger and better things, namely co-presenting the Six and then moving up to having the One to herself when Anna Ford left. As far as I'm concerned, taking the same job you had 15 years ago when you've since had a higher profile role is a demotion. That's why Cando asked if it was a joke.

Freelance presenters doing work for organisations that aren't direct competitors is a little different. Likewise Jon Sopel had (at least prior to his World News days) a regular feature for CBS News, Katty Kay regularly appears on MSNBC's morning programmes, and various others from Adam Bolton to Jon Snow have appeared on BBC programmes in commentator positions.

That's quite different, however, to working for a direct competitor (national television network) in the same capacity (as a presenter in daytime, factual programming). I'm also certain such work wouldn't be allowed if she were a full time employee, though there's a strong chance she's a freelancer/ under contract through a service company.

[For what it's worth, I'd much prefer Suzy Klein and/or Annita Anand continued on Saturday Live permanently; somehow I never quite felt Sian fitted the quirkiness of the programme.]

I think Eamonn Holmes is doing the closest thing possible; breakfast TV and then morning/daytime TV on a Friday.

David Hamilton used to finish his Radio 1/2 afternoon show (younger readers will be amazed to learn that in the 60s and 70s the two stations simulcasted for long periods of the day) and then hot foot it to Thames at Euston to be duty continuity announcer for the evening. I even recall him mentioning it occasionally, as he signed off of his radio show.

Reporter John McGuire presenting breakfast today...first time?

Yep , as far as i know today is his first time presenting Breakfast.
EDIT: He's mentioned several times that it is his first time.