Ok so here we go:
Disneyland is not a circle. Especially not a perfect one. Although they are generally 'rounded' in shape, and follow the 'hub' concept, each land sprawls as it needs to. Also bear in mind that whilst the berm for the railroad follows a relatively circular shape, that is not the boundary of the park as many ride show buildings extend beyond the berm. Expansions and additions also ruin your circle - Hong Kong Disneyland's expansions to date have all been outside the railroad. In addition, whilst the park may have a vague 'circular' shape, you ignore all of the support and logistics the park needs, which typically fill in the gaps and square off against the correct property boundaries. Lastly - Hong Kong (and Magic Kingdom) showed us that to build a 'disneyland' park, one doesn't need the same amount of land as previous parks - it can be bigger or smaller.
Why would you travel somewhere for a complete replica? first of all - none of them are. Each park has its own subtle differences whilst still being true to the 'americana' that is Disneyland. Each still has 'familiar' things - like main street, and the hub, and the castle, but each does things differently too.
Sorry but - Disney has built in the middle of nowhere many times over. The original Disneyland was in a field of orchards a great distance from the population sprawl at the time. That was the issue - there was much land surrounding the park easily snapped up by people wanting to cash in on the disney tourism in the area, so Anaheim developed quickly into a sprawling trashy tourist metropolis. This is why Walt set about building his second park.... IN THE MIDDLE OF NOWHERE in florida - only this time he bought thousands of acres of land all around his chosen site so that nobody else COULD build near him, whilst also giving room for expansion. I believe Paris Disneyland is the same situation - its a huge trek from metropolitan centres, and TBH - Hong Kong Disneyland is about as far from Hong Kong as you could possibly be out on Lantau Island - although everything in Hong Kong is relatively close - so its hard to be far from anything there.
As for Kiwikurra - hell yes i'd go. I don't care where it is.