I must say that I find it quite worrying.
The thing I'm wondering about mostly is, why it has been shut down (if actually has). I can't be for the reason of lack of funding. The google ads that were on the site should have raised a load of money. And even though the majority of people don't pay a thing to have their Brickshelf account, the people that do pay will also pay quite a lot when you add them up.
If it's just for the reason of lack of time, it would also be a bad excuse. I'm sure there are plenty of people who are gladly willing to help out in keeping the site up and running.
Let's wait for some official news from Kevin.