If this is true, there needs to be A reason to go there. It can't just be an "in addition" to what we offer. Shops and Dining are nice, but it'd be pointless to spend all that money and resources to alleviate a small traffic issue that only arises during the insane times.
It's also perfectly acceptable to have DTD has just as an "in addition", and not go all-in like this rumored expansion suggests. Just fix up the Pleasure Islands side of things and you are on the right track.
And please don't say DisneyQuest brings people....