Sorry. I hope I didn't come across as "arguing". Not my intention at all. Just talking about an effect, and I totally respect your views. But I have to disagree with you on this point. Let's agree to disagree.
The new Harry Potter area, (it's coined as a "Park within a park",) is going to take up a lot more space than what Sinbad can offer, let alone what encompasses "The Lost Contenant" has, as far as space is concerned. Sinbad barely takes up three achers, the new area requires at least 20. Only 17 more to go.
While the The Lost Contenant does seem to have theming which might go well with HP, that area of the park is kind of "constrained". Below, I have a link to Universal's IoA. (IoA is on the top half, while two white areas, divided by an on/off ramp, is where I think the new HP area will go.)
A link to Google Map of IoAThere is a frontage road, along with Production Plaza and Turkey Lake RD. which frame the area, and Suess's Landing to the right and Jurassic Park to the lower left. (upper left corner of the park.) There's no place to expand into, even if the entire area was demolished. There's simply not enough room there. I have my doubts that they'll take out DDs.
Besides, park makers, as you may already know, like to start out with a large expanse of land. More than enough to do with as they like. The Lost Contenant not only is hindered by the main roads, but is an island. Space is at a premium there already. The cleared area I have located on the map, is Blue Sky, a blank slate. Much more inviting for development.
The announcement said the new area was going to be like 20 achers or so. In these terms, you almost HAVE to think that this is something that's going to be a park onto itself. Ergo, not just a new themed area with a smattering of a few rides and a few shops & stalls, but a park themed to Harry Potter. Knocking down a few attractions isn't going to provide that kind of space.
Note: They have already cleared an area for the project. All they have to do is relocate the ramps and it's a cleared area. Suffice to say, Universal goes over the top, my guess is that they'll build a tunnel over this roadway and cover it with sand to hide it from view. One side being Hogwarts and the other side, Diagon Alley. At least, that's my opinion. But, time will tell.