I like stories like Otherland simply because it will make people think. Through works like this, people like Tad Williams are able to inspire. What I mean by that is the idea of Otherland is in many ways similar to the internet that we all use today. From stories come ideas, and ideas for some people also mean invention. Yes, I mean some genious in the future happens to read Otherland and says, "I can create a simulation just like that!"
I am not saying it will happen exactly like Tad has described it in Otherland, but I really do believe that these Massive Multiplayer Online Roleplaying Games that are so prevelant on the internet today, they are just the beginning.
Stories like Otherland can provide the inspiration that is needed for someone, someday, to create something similar. That is why I really enjoyed the series.