All very good points.
The blog as ever will be about the oldhammer community, what are they up to, where are the best posts.
As to posting again I'll happily give access to others if they have a track record for good stuff or if new are very enthusiastic and persuasive but there probably needs to be a limit.
Four possible options (there are other options I'm sure):
Myself or someone else does all the work and sees if the thing is interesting enough to keep going.
The disorganised chaos way, open the blog up to those who care and leave them to it.
The structured way, someone takes responsibility for an aspect of the community, miniatures, painting, 40K, Fantasy whatever and posts regularly every week or so giving the best of each subject.
The very structured way, seven active authors seven days, post up your favorite thing of the week on your day.