There are a number of reasons that no photobloggers have crossed over to being serious, successful fine arts photographers:
The first is that there are about five serious, successful fine arts photographers in the world, and until one of them dies, the slots are filled (does anyone know if Gursky smokes?)
The second is that most photobloggers are using the wrong cameras-- shooting on 35mm SLR digital, when the big photographers are using medium and large format film cameras.
The third reason is that photobloggers don't design and execute original, challenging projects-- instead we roam around and shoot whatever (and whomever) we happen to come across. This weekend I saw four shows-- Robert Capa (war documentary), Jill Greenburg (studio pictures of bears), Edward Burtynsky (quarries around the world), and Thomas Demand (photographs of his original paper sculpture.) None of them just stumbled into those shots-- they designed and then executed a complex project (sometimes over many years.)
Fourth, fine arts photographers have skills and tools that photobloggers just don't have-- experience in studio lighting, advanced Photoshop retouching, large format printing, or negotiating access to restricted places-- skills that photobloggers haven't had the time, interest, or wisdom to cultivate.
Until some of these things change, we're never going to see a photoblogger break out-- cross over into serious galleries and museum collections. Honestly, that might not happen even if one of us did this stuff-- fame is unpredictable. But until some photoblogger actually takes the time to get good, we'll never know.
We have got to suck less.