To the average guest, I believe a “connective narrative” pretty much already exists between all the parks simply by the fact that they are all Disney Theme Parks. Beyond that, I believe each park should be striving to maintain as much individual identity as possible to give guests more incentive to venture out and see what unique things they have to offer.Honestly why is anyone surprised or even against Disney trying to create backstory to connect all the Disney Parks together. A connective narrative across all Disney Parks is something that a lot of Disney Park fans will likely eat up. I can understand how DL purists want DL to remain unique and independent but that isn't who Disney is anymore (and hasn't been for at least 5 decades now).
My honest opinion is this is something the storyteller in Walt would have enjoyed. Others may not agree but that is my opinion. Had he lived to see his empire grow to multiple resorts around the world it would have made sense to connect them via a backstory in someway. Now the backstory might have been better, but its very likely a backstory would have been created.
Also remember this is Disney trying to drive attendance up around the world. It gives incentives for Disney Park goers to watch the D+ shows, book trips to various resorts around the world, and to be part of the story. Its part of Disney's DNA as a company.
Personally I'm interested to see where they go with this. And for DL purists, I wouldn't worry, I highly doubt that its going to be anything more than references in the various queues around the resort. Just look at Tropical Hideaway as an example with its references to S.E.A already in place now for a couple years.
Simply put, when I’m in Epcot, I want to be focused on the story of Epcot and not be bombarded with “backstory” about how it also connects to Magic Kingdom, California Adventure, or Shanghai Disneyland. If that is truly the focus of WDI moving forward, then I think that’s backwards.
The parks do not need to be homogenized any more than they already are, by what equates to a bunch of Easter Eggs that might connect certain characters with certain attractions (not entire parks).
And quite frankly, if Disney feels like they have to bank on the continued implementation of things like S.E.A. in an effort to get more guests excited to visit the parks, then something is off at a pretty basic level.