You can prepare for whatever you want. I was just pointing out where you were factually incorrect. There was no concept art released with the initial Avatar announcement in 2011.
I was not trying to be snarky, but was rather explaining how your statement was false. Concept art was not released with the Avatar announcement in 2011. How could it be? Imagineers weren't even aware at the time that there was an Avatar project. In 2011, all that existed was an agreement between Cameron and Disney to develop a land. That's when work on that land began.
I'm not sure why you pin anything about Avatar's timeline on WDI. Disney has drawn out timelines for construction, but the development and build out with Avatar is perfectly in line with other projects that Disney has done in the park. They typically take ~3 years from groundbreaking to completion to finish a new land. That's the timeframe that is planned for Avatar and what occurred with Cars Land and the Fantasyland expansion (the overall FLE took longer, but that's because they didn't start work on the Mine Train until well after the rest of the land; the individual attractions were all completed by 3 years or so).
I'm not making any prediction as to when Star Wars Land will open. I'd suggesting when it could open based on previously established timelines by Disney. 3 years is a long time to build a land, but that is what Disney typically does. So, when I say it reasonably could be open in 2019, that's taking into account Disney's bloated timeframes to build. Maybe it will open by then, maybe not -- but you are making it sound like that's some unprecedented pace for Disney and it's not. That's my only point.