i thought there exists something like that already, it's called reverbnation or something? though i'm not entirely sure it is what you meant... I think the problem is that there are too many sites/networks like that out there already, so people/fans are scattered all over the internet, while having one official band website like
www.vintersorg.com would make them all go there for the news/merch/what not, instead of Pete following on twitter, John on myspace, Jane on facebook and Joe on reverbnation. It also would require
just one update instead of 100x all those networks. I think what we are going to end up with, is that bands will be updating only myspace today, forgetting the twitter, only facebook tomorrow forgetting the myspace etc etc. You get the picture. I would really hate that, as that would mean joining
all of those networks or missing out on important updates...