I'm not one that really cares if the line-up leaks 6 months out. It doesn't bother me and only gets me more excited.
But imagine, just imagine, if there was a year where no one knew the houses until the first night of the event. Well, aside from shoving Walking Dead down our throats, there would be seven other houses that we be a total mystery until the first night of the event. How exciting would it be to walk around the park and discover them one by one.
Try to visualize turning into Kidzone and approaching the maze's entrance marquee. What house will it be? As you get closer and closer you start to make the sign out a little more. "Does that say Stephen King? Is it a Stephen King house?" you say to your buddy. It is! And neither you or anyone else in the general public had any idea. How exciting! But what could the next house be? At this point you are too excited and curious to afford standing in line waiting for the Stephen King house. You are your buddy decide to take a lap around the entire park just to see exactly what you've gotten yourself into with the other houses. One by one you discover the various houses, and you can't help but wonder what 8 new houses you'll discover in exactly one year.
That is MY unrealistic dream. Much more so than having another HHN 18 year with an elaborate backstory on the website.