So, I'm rehashing here, but I think we all are at this point.
Personally, I don't think the idea of a 3rd Epcot entrance has any credibility at all. Even if you put aside the logistical issues (backstage areas, or whatever), it simply makes no sense to incur the long-term operational costs of a dedicated entrance,
plus the non-negligible initial construction costs for that entrance, all for the sake of a one-shot profit on sales. This is a company with a market cap over $170 billion and annual revenue around $50 billion. They're not going to casually pass on an opportunity to bring in a few hundred million, but there are limits to the lengths they will go to make it happen.
So in terms of park access, we're left with the bridge/canal to the existing gate, or maybe dedicated buses. I think both of these are entirely possible. But are they enough? Like I asked upthread, does anyone over the age of 8 actually consider a 20 minute boat ride to be "good" park access? And I can't see anyone getting excited about buses, dedicated or otherwise.
I have to agree with
@lockedoutlogic on the location thing. It's great if you're a bird, but otherwise the logistics really aren't promising.
Doesn't mean they won't build a standalone DVC there. And no doubt they'll even sell it, because: "I really want to be part of DVC ! Welcome Home!", "it was what they were selling when I wanted to buy", "I can always trade into another resort", "resale is too complicated" (or "I didn't know resale was a thing"), and "I already spend $5000/year on Disney accommodations, so my $50,000 DVC contract will pay for itself in just 10 years (plus an extra 5 years to pay off the loan interest, and then there's the dues - but those things don't really amount to much, right?)".
The worst thing is that I think a "regular" DVC with sub-par park access could actually be even worse for system balance than the moderate concept I floated earlier. If you assume that both pricing and nightly point costs are similar or even higher than other recent DVC construction (because, if this is a deluxe DVC, you can bet they're not going down) - someone who buys enough points under that structure to stay for a week is going to expect to be able to trade into GF or Poly. And they'll have enough points to do it. At least in a moderate model, buyers would know (or quickly learn) that their 50 or 100 pt contracts are not going far at the deluxe resorts. Plus you have the reverse draw of the point stretchers who might be willing to overlook the reduced amenities of a moderate if the price is right.