One thing Jimbo said in the Wired interview he did is that since the site will be crowdsourced, the donors will be able to decide what the journalists cover. So more niche topics might get covered this way if there is demand (the example he gave was "dog breeding").
I wouldn't be so sure. Talk is cheap. Once you select for people who are willing to make a donation, I bet you'll end up with a fair share of actual grown-ups who want to talk about real news.
