There's been quite a bit of complaint about the Japan coverage at the expense of all other news. It's been said that 'how come they have time for a weather forecast but not other news'*.
I must say I agree - but the problem News Channels have is that if someone switches on and they're not covering a major breaking story, the viewer will switch to a competitor.
So why don't they do this...
Admittedly it's not perfect - both pictures are small, and there could be problems with framing and safe zones - but it'd only be for say 5 minutes per half hour, and - I think - has far more pros, in terms of being able to deliver more content, than cons, in terms of not looking perfect all the time.
(*they obviously do weather as it gives the presenter time for a breather!)