Keep the name
I vote to keep the name EN World.
I was saddened the day 3rd Edition News closed and nervous when EN World took over. It may have had the same content, but was not familiar. I left the news for about 4 or 5 months.
Eventually, I tried out EN World again. I have been visiting almost daily ever since. I like the name, the banner, the logo, etc.
There are a lot of things in the world that may not be the most colorful, descriptive, or accurate. Many of these are still very popular. There are companies that continue under the name of the founder (not exactly the same in this case, but close) even though he may be dead and the family completely removed from the company (heck, at least Eric is still alive and involved). I also do not know Eric personally, but he does not seem to be an egotistical, self-promoting, buffoon as are so many how attain name recognition. I think we should the name in the spotlight (even if it is only in a small corner of the Interverse).
Other posters have already stated recognition, logo-bearing products, and nostalgia so I have nothing new to add.
Now, I am not a wrestling fan, but I have watched in the past. When I heard that they had changed to WWE (from WWF, this happened somewhat recently I believe, but am always last to find things out anyway) I couldn't help but cringe a bit. Now, admittingly, I am smart enough to realize it is still the same product but I can't help but look at it skeptically as an upstart new company.
Change for the sake of change is not always good. Since you have not stated that you dislike EN World, and you have stated that this is not a marketing strategy you have no real reason to change the name. This is not being clamored for by the masses. Seeing the sight promoted by a Dragon Magazine article only supports my opinion of EN World as the best d20 resource on the Net.
Feel free to change the layout if you must. I am not a very organized person, so have not problems with the current layout as it seems very organized to me. Also, any change will have the initial effect of causing me to relearn what was natural (not the same as learning something new, and only exceptable if the change is an improvement upon the original).
So, in closing, I will say thank you for coming to the community as a whole for reactions/opinions on your idea before making any changes. I think that we all appreciate it (I know I do).
My 2 cents worth (whew, with inflation and all, I really should charge more)...