New Blog template help

I own and I have 114 cities lined up.

I have made the cities with the new blog template system and really dig it.

On all of these cities I have people that have written articles and posts that are out in the world.

I need to update the over look of the tremplate and widget layout in my template that I am using for all of those cites. Is there anything I can do to make it also change all of the blogs I have made with it.

And if not, if I delete the blogs is there a way I can just save the articles/posts that have been written?

Maxx Fairo