The lines for Star Tours and Tatooine Traders 48 weekends out of the year just don't show a huge pent-up demand for more Star Wars.
I'm not putting this question to you directly, more to the folks questioning the "demand" for a Star Wars expansion as a whole, just using your quote as the more recent one to pull from.
Maybe it's the SW fan in me that has a hard time agreeing with that line of reasoning, but I cannot fathom the thought that a SW expansion is anything less than Disney being able to print money.
Someone threw out the number earlier that made my jaw drop, then nod my head in agreement with. The Star Wars franchise has a total revenue of 27 billion dollars (
http://www.statisticbrain.com/star-wars-total-franchise-revenue/). That's 18 Next Gen projects all stacked on top of each other (yeah, net vs. revenue, etc, I know there are differences, but the main point is it makes $).
Star Wars also has a few other things going for it. 1) It's a cultural landmark. A vast majority of the population of this country (and many, many others) are aware of the franchise. A large portion of that population in the US grew up with the franchise. It's been a part of the pop culture zeitgeist for over 36 years. It a HUGE part of my childhood, as I would imagine would be the same of the childhoods of many people in my generation, the generation above me, and the generation below me. This is a franchise that has not put out a film in 8 years, and arguably a decent film in 30 years (33 years?). It survived the widely disregarded prequils to continue to make money year over year. The last decade of Star Wars fandom has shown a few middling-to-bad films, books, comic books, a few hit-or-miss video games, and an (Emmy winning) animated TV program (which also had a disregarded film to launch it), not what I'd call saturation of the market with high-quality product. Still it endures, or honestly, thrives. Disney announces that they bought Lucasfilm and the internet explodes. A few rumors leak about this expansion, and it does again.
More importantly, the people that grew up with Star Wars are right at the age to have children. Children who have likely been introduced to Star Wars by their parents. If their parents were fans, likely, their children will become fans as well. People alway speak of Disney coveting the "boy" demographic. While I'd argue that Star Wars is not strictly for boys (my daughters love it, and I'll always argue targeting only "boy" vs. "girl"), this and Carsland/Pixarland would give them a massive draw for that demographic. Parents who grew up pretending every snow-day was the battle of Hoth are going to find their way down to Orlando at some point to walk through the new area. Updating an existing ride (ST2.0) is not enough, but the addition of an entire "land" will be. If the land is done well, it's going to bring repeat business, word of mouth business, etc.
Plus, add to the fact that starting in a few short years, Disney is making a major investment into the franchise. Barring a major disaster in the next few films, demand for the franchise is only going to grow. Now you'll have parents who grew up loving the franchise, and their kids having their own franchise to love as well (which to some extents even exists with the prequils).
I don't think that looking at Star Wars Weekends or Celebration is a good gauge on the demand. As a huge fan, I've never felt the need to do either of these events. I'm not going to make my family vacation plans line up directly with a specific weekend or set of weekends, I'm going to do it when it works for my family. But if something like this was a part of the park? A Star Wars themed land I know will always be there no matter when I book my trip? It will be guaranteed that I make sure that my vacation plans include DHS. ST2.0 is just about the only thing currently that makes DHS a "must-do" for me right now as is, because of how much both myself and my kid loved it. The special events like this are for the true, die-hard fan.
When Harry Potter land was announced, I really doubted it's ability to remain relevant in popular culture long enough to make the investment worth it. I was wrong to doubt that, as it's shown to have the legs, and more importantly, Uni made the land well-done enough it wouldn't matter if it did or did not, it still would be a great land that visitors would be drawn to. Star Wars does not need to prove itself on this front. It does have longevity, and it will continue to do so. All they would need to do now is to make a quality land, and they will be printing money. Will it draw new visitors to the area, will visitors stay at the park longer, will visitors spend more money at the park? I think that this is as close to a guarantee as can be made in this fickle business.