Yeah most of the features you're talking about implementing have been done already. I guess if you have the money and backing you can try to enter into an area to compete with the big dogs as it were, but unless you're offering something that's a GINORMOUS upgrade to it (ala Wowhead v Thottbot), I don't see how you'd succeed. EJ, by the way, is working on an easier to digest, much more accessible 'knowledge base' via
http://elitistjerks.com/f47/
Personally, I'd like to see a much more thorough and competent view of progression. Like bosskillers, I suppose, but not quite as dick-in-the-ass queer. First level 70s, first level 80s, first boss kills listed by damn patch, first gate openings, first non-runny dog turds, comprehensive, accurate, and awesome.