It is a good idea, and we've thought of these things as well, like "popularity of realm" and some measure of "fun-ness of realm", but many of these measures can be manipulated and gamed, and so it is difficult to come up with something good.
For example, "letters per day" can be spammed, religions and guilds can be spammed in every region with no real thoughts, CS can be simply a lot of militia but actually nothing happens, regions lost/gained is a little more telling, but in all seriousness, most realms have that at about 0 most of the time.
Your ideas are certainly a great start, now we need to continue to refine them and understand what we *really* want to measure and how we can do so in a fair and simple to understand way.
