This is actually the great fear about WikiTribune: that it'll end up like Wikinews - nice launch, then drop to near no activity, point or interest. (I was along for the WikiTribune hack day in February, this is one of the things that was discussed at length.)
Wikipedia was a chance to craft something long lasting over a period of time. Wikinews involved a similar amount of effort per article but invariably the item was largely irrelevant a day or two after it was written. It was hard to keep the news current.
Out of curiosity, do you know if the group has any specific ideas in this regard and what they are?
Then I looked up the Wikinews process ... and it was about the same. So clearly that wasn't the problem.
The difference with WikiTribune is that there are paid journalists. This will I think help.
[1] https://en.wikipedia.org/wiki/Wikipedia:Role_of_Jimmy_Wales#...
> Unlike Wikipedia, Nupedia was not a wiki; it was instead characterized by an extensive peer-review process, designed to make its articles of a quality comparable to that of professional encyclopedias. Nupedia wanted scholars (ideally with PhDs) to volunteer content.
I'm afraid that doesn't tell us the difference between Wikinews and WikiTribune.
But my argument is that if WT's differences -- even if they are seemingly superficial like visual design and polish -- are enough to give WT even a veneer of authority and user-friendliness over WT, then the lack of fundamental differences is mostly besides the point. WT is a direct competitor to WN, few users are going to want to spend time/loyalty to both sites. And unlike Wikipedia, which has huge long-tail value, writing for a news site with a comparatively small audience would be a bit demoralizing when you could be writing for the much bigger competitor, especially if the pay (zero dollars) is exactly the same.
So the difference to WN is that if WT becomes more popular -- which it could just by Jimmy Wales continuing to be its salesman -- WN might become quickly lose its audience and purpose for existence.