I agree with the first part. After seeing what Disney's been doing over the past decade, anyone who thinks this expansion arm of Disneyland isn't going to be a couple of IP lands with possible clones is really fooling themselves. Expanding Disneyland to the west would cheapen the park.
So then if they don't expand Disneyland, but expand DCA (like everyone is claiming is needed), then you can only expand DCA so much. It can't utilize that entire west side...it would be too big. So then you'd have to fill in the northern part of the west side with a hotel or more shops or a redesign of DTD or a DisneyQuest or whatever. If you wanted all of that west side to be theme park, BUT feel expanding DL would be bad, then a third park is more favorable.
Let me tell you the problem with DCA. It's NOT that it needs expanding, but reengineering. Disneyland has more attractions per square foot due to better planning, and (at least when Tomorrowland was in its heyday) better attraction layering.
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The red zone is approx. 40% of the park. How many attractions are in that red zone? Two? Three if you count the Redwood Challange (how many people spend time in there?). Three attractions for 40% of the park? Yikes!
I like Pacific Pier, but that area (plus the winery north of it) has no attractions but is the same size as Fantasyland from the castle to the storybook land and there are 10 attractions there.
Sure, you can argue DL has large areas with few attractions (subs/autopia, Rivers of America, even Galaxy's Edge) but I think DCA is far worse when it comes to attractions per acre.
So okay, they expand DCA west, but given how Disney currently thinks how many additional attractions would we get? Two? Three? Yeah, it's not all about attractions as I love other aspects of the parks, but I still think DCA can expand and grow within its own current confinements before needing to expand west.
All I'm saying is if they do expand DL and DCA west it'd better be friggin' good because I don't want to hear years of complaining if it's not. I already hear enough about GE and AC (or even the lackluster nature of Enchanted Tales of BatB).