Yes, a new SW land would be a lock if they didn't make any more movies. But a bad Episode 7, would have damaged the brand, perhaps beyond repair. If they were never able to reclaim the magic of the original movie or trilogy, after 2 additional attempts, the brand would have suffered. On the other hand, had they not tried the 3rd trilogy, they could have built SW land, with a focus on the original 3 movies, and kinda forgotten about the other 3.
I have some worry about avatar land. This is the opposite situation, and may or may not have played into the timing of SW land. In the case of avatar, the land isn't cannon, its just the land as I understand it. But what happens to the land if the sequels head the direction of the Matrix trilogy. What if the second and 3rd movies don't catch fire, does it take away from the land. I don't think so, IF it was build to be a visual and sensory experience, and IF the land is film independent.
Using the same type of timing as Avatar, imagine a SW land being built 10 years ago (or so) during production of the second trilogy... It might have a huge investment in the Pod Racer Ride and a Jar Jar Binks meet and greet. 2 -3 years later their would be tumble weed blowing down the streets of Nabu and people would be bored with it (at best).
Nothing is a lock, and timing is always easier in hindsight than in reality.
