Well, fixed width is much easier to sell advertising on, since you can insure a specific banner size and an experience where people will see the banners.
I have missed this change though, since I am still seeing the legacy Star Wars theme.
Sorry to hear that the variable width won't be supported.
The only thing that drew my attention to this was the missing Junkyard! When I went to the Off Topic to read or start a thread, I saw the notice.
That, too, it seems is done to homogenize the site and make it more palatable to more people, i.e. advertisers.
I guess if you are trying to sell ads and make money, this is all great progress. You want more ads and more people to see them.
I wonder , though, what it will mean as more people come in, including the people who hold trademarks and copyrights nearer to their hearts (well, I guess lawyers, too!)
I like the new logo though. I guess I need to go check out the new settings and see how narrow this fixed, commercial-friendly site is!