The promise is/was not 'reporting by those who know most'. The promise is lower barriers, democratisation & meritocracy. Scobles & Arringtons compete against Cunninghams and Torvalds on equal footing.
If success is derived from or defined as 'most readers' (not obvious in the context of blogs), then it is mostly a consequence of who people want to read. But you don't need to be concerned with blogger success. You can read whoever wants to write.
That is the promise of blogs. Anything about what the content of blogs would be was always speculation. The promise is that anything can be thrown at the wall by anyone.
If success is derived from or defined as 'most readers' (not obvious in the context of blogs), then it is mostly a consequence of who people want to read. But you don't need to be concerned with blogger success. You can read whoever wants to write.
That is the promise of blogs. Anything about what the content of blogs would be was always speculation. The promise is that anything can be thrown at the wall by anyone.
Some experts got thrown against the wall too.