For my family, building BK with a really creative "thrill" ride is the difference in our visiting or not visiting again. My kids have placed AK at the end of their wish list. Something like Reign of Fire (Or whatever) would bring us back, just like TOT always takes us to MGM, and now Spiderman brings us back to IOA. Build a cutting edge, "Wow" attraction and we are there!
The AK is such a special idea, I really want my family to want to go. It's one really special attraction short.
The other thing I would like to see is another great full service restaurant. Dinosaurus and similar doesn't really cut it for us. I always like to take the time for one full, sit down meal in a creative restaurant. It also helps us with my son who is diabetic. We have to come all the way back to the entrance for the Rainforest Cafe, and I would like to be able to find one somewhere inside the park.