You all need to stop this inane argument. You know what else wasn't planned? The original trilogy. Movies, especially movies in large franchises with different directors aren't just magically planned out ahead of time. That's not how it works.
Also all the movies since Disney took over the franchise have made more than what Disney originally paid for. If that's not a "Great" job I don't know what is.
And, it showed. Yes, people do expect progress from a trilogy made 30 years ago. Despite Lucas' ramblings he had no idea SW would be successful and he'd get to do a trilogy, Disney went into the Sequels knowing full well it would be a trilogy and decided to plan nothing.